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The Kingdom of Africa was an extension of the frontier zone of the Siculo-Norman state in the former Roman province of Africa (Ifrīqiya in Arabic),[a] corresponding to Tunisia and parts of Algeria and Libya today. The main primary sources for the kingdom are Arabic (Muslim); the Latin (Christian) sources are scanter. According to Hubert Houben, since "Africa" was never mentioned in the royal title of the kings of Sicily, "one ought not to speak of a 'Norman kingdom of Africa'". Rather, "[Norman Africa] really amounted to a constellation of Norman-held towns along coastal Ifrīqiya."
The Sicilian conquest of Africa began under Roger II in 1146–1148. Sicilian rule consisted of military garrisons in the major towns, exactions on the local Muslim population, protection of Christians, and the minting of coin. The local aristocracy was largely left in place, and Muslim princes controlled the civil government under Sicilian oversight. Economic connections between Sicily and Africa, which were strong before the conquest, were strengthened, while ties between Africa and northern Italy were expanded. Early in the reign of William I, the Kingdom of Africa fell to the Almohad Caliphate (1158–1160). Its most enduring legacy was the realignment of Mediterranean powers brought about by its demise and the Siculo-Almohad peace finalised in 1180.
Regarding the motive for the Normans' military involvement in Africa, historian David Abulafia raises three possibilities: religious ("the extension of crusading activity into a relatively neglected arena"), economic (such as "the protection of key trade routes"), or imperialistic ("an attempt to build a vast Mediterranean empire").
Sicily and Africa had close and growing economic ties during the period 1050–1150. The Sicilians imported gold, shipped by caravan across the Sahara to Kairouan (Qayrawan) and Mahdia (al-Mahdiyya), and cloth manufactured of Egyptian and local flax or cotton imported from India and Sicily. Besides this cotton, the Sicilians exported large quantities of wheat, cheese and processed meats. The Greek Orthodox monastery of San Salvatore in Messina was permitted to export its surplus wheat to north Africa in return for wax for its candles. During this time, Africa (i.e., the old Roman province) underwent rapid urbanisation as famines depopulated the countryside and industry shifted from agriculture to manufactures. The depredations of the Banū Hilal and the Banū Sulaym also destroyed many fields and orchards, and forced the population to seek refuge in the towns.
Count Roger I of Sicily (1071–1101) is known to have maintained men in Mahdia to collect export duties, while Roger II (count from 1105, king 1130–1154) twice sent forces against African towns when their rulers defaulted on payments for grain imports. In 1117, when Rafi, governor of Gabès, challenged the trading monopoly of his overlod, Ali ibn Yahyā, emir of Mahdia, he asked Roger for assistance. Rafi was trying to send out a merchant ship from his own port, and Roger responded by sending a small flotilla, which fled when confronted by Mahdian forces. Ali then arrested the Sicilian agents in his town and requested help from his allies, the Almoravids, and Roger pleaded with him to return relations to normal. A low-level naval war of raids and counter-raids ensued between the Normans and the Almoravids into the 1120s. The most serious raid took place against Nicotera in 1122, when women and children were taken captive.
In 1135 Roger II made his first permanent conquest (if Pantelleria in 1123 is not counted African). The isle of Djerba, which, according to Arabic sources, "acknowledged no sultan" and was a den of pirates, was captured by Roger, who carried off many of its inhabitants. Sicilian Muslims participated in the conquest of Djerba, but it is unknown what happened to the ancient Jewish community on the island, which was still there (or re-established) in the early thirteenth century. Djerba gave Roger a base from which to exert more influence over Mahdia, which, unable to pay for its grain, was forced to become a protectorate of Sicily by 1142. Its foreign affairs fell to Roger, who forbade alliances with other Muslim states inimical to Sicily, and probably received its customs revenues in lieu of payment for the grain needed to feed it. Roger also had a right to seize any city rebelling against the lordship of the emir of Mahdia. The emir himself, Al-Hasan ibn Ali, whom Ali ibn al-Athīr calls the "prince of Africa", was personally indebted to the Sicilian fisc, quite possibly as a result of his luxurious tastes. One Arabic chronicler noted how "the accursed one [the king of Sicily] imposed the toughest conditions, and he [the emir] had to accept them, and he offered him obedience so that to all intents he became a mere ‘āmil [governor] for Roger".
Two Latin chronicles, Robert of Torigny's Chronica and the anonymous continuation of Sigebert of Gembloux's Chronica, are the only sources to assign religious motives to Roger's conquest of Africa, coming as it did at the same time as the Second Crusade and the Wendish Crusade. Roger is not known to have received any papal approval for his African venture. The Arabic sources do, however, refer to his army as being recruited from all around Christendom, an assertion which may be more hyperbole than fact. Ibn Idhari says that Roger "called to arms the people of every Latin country". One non-Italian knight, Richard de Lingèvres, did participate in the capture of Tripoli and was rewarded with land in Apulia. He is perhaps the same person as Count Richard of Andria.
There is evidence that at least some of Roger's contemporaries, mostly his enemies, saw his conquests in Africa as usurpations. Gervase of Tilbury, in a suspect passage of his Otia imperialia, implies that the Emperor Frederick I, who regarded Roger as a usurper in southern Italy, was upset by his extending his power into the old Roman province of Africa. And according to the Erfurt chronicles, at the Diet of Merseburg in 1135, a delegation from the Republic of Venice complained to the Emperor Lothair III that Roger had seized Africa, "one third of the world", from the king of Gretia (Greece). This garbled report completely detaches Roger's actions from the interreligious context by making the victim of his predations a Christian ruler. The Venetians' primary concern was Roger's ambition.
Even the chroniclers of Roger's own kingdom believed his ambition played a primary role in his involvement in Africa. Archbishop Romuald of Salerno in his Chronicon wrote that "because he had a proud heart and a great will to rule, because he was not simply content with Sicily and Apulia, he prepared a vast fleet, which he sent to Africa with very many troops, and [Roger] took and held Africa." The pseudonymous court historian "Hugo Falcandus", in his Liber de regno sicilie e epistola ad Petrum panormitane ecclesie thesaurarium, also emphasised Roger's desire to expand his kingdom:
[H]e took care no less by force than by prudence to defeat his enemies and to extend his kingdom to its furthest limits. For he conquered Tripoli in Barbary, Mahdiyya, Sfax, Gabès and many other barbarian cities after undergoing many labours and dangers.
The incorporation of northern Africa into the Sicilian kingdom would have posed no problems for Roger. The cultural connections between Sicily and northern Africa were stronger than those between Sicily and his own peninsular Italian domains.
Rise and fall of Norman rule in Africa
In 1087, when the organisers of the Mahdia campaign asked him for his assistance, Roger I, who since 1076 had an economic treaty with the Tamīm ibn Mu‘izz, emir of Tunis, refused, saying, "As far as we are concerned, Africa is always there. When we are strong we will take it."
Conquest of Tripoli and Mahdia
In 1142/3, Roger II attacked Tripoli, further south down the coast from Mahdia. In 1146 he besieged it and took it. The city had already been depleted by a series of famines and was practically in a state of civil war when Roger's troops assaulted it. It was still an important port on the sea route from the Maghreb to Egypt. Several of the minor emirs in the vicinity of Tripoli sought Sicilian overlordship after this. Yūsuf, the ruler of Gabès, wrote to Roger requesting "the robes and letter of appointment making me wāli of Gabès, and I shall be your deputy there, as are the Banū Matrūh who hold Tripoli from you." Roger complied and Yūsuf, in his new robes, read out the letter of appointment to an assemblage of notables. Gabès had long been an irritant to Mahdia, and al-Hasan of Mahdia attacked it and brought back Yūsuf to Mahdia, and stoned him to death. It is possible that Roger's attack on Mahdia in 1148 was a response to this insubordination on the part of its emir, but Ibn al-Athīr suggested that Roger was merely taking advantage of a famine in Africa, despite the fact that he had a treaty with al-Hasan until 1150.
In June 1148 Roger sent his admiral George of Antioch, a former Mahdian officer, against al-Hasan. Off the island of Pantelleria the Sicilian fleet encountered a Mahdia ship bearing some carrier pigeons. George had the birds sent home with false messages that the fleet was headed for Byzantium. When the Sicilians reached Mahdia on 22 June, the emir and his court fled the unprepared city leaving their treasure behind. This was seized as booty, but the Sicilians were given only two hours to plunder the city while its Muslim inhabitants took refuge in Christian homes and churches. Roger quickly issued a royal protection, or amān, to all the city's inhabitants. According to Ibn abī-Dīnār, George "restored both cities of Zawīla and Mahdiyya; lent money to the merchants; gave alms to the poor; placed the administration of justice in the hands of qadi acceptable to the population; and arranged well the government of these two cities." Food was released to encourage refugees to return.
On 1 July the city of Sousse (Susa), ruled by al-Hasan's son ‘Ali, surrendered without a fight, and ‘Ali fled to his father in Almohad Morocco. On 12 July Sfax fell after a short resistance. The Africans "were treated humanely" and an amān full of "fine promises" was granted for the entire province, according to Ibn al-Athīr. Ibn Khaldun, in his Kitab al-Ibar, records the abuse the Christians of Sfax heaped on their Muslim neighbours. The Banū Matrūh were left in power in Tripoli, and in Sfax Roger appointed Umar ibn al-Husayn al-Furrīānī, whose father was brought to Sicily as a hostage for his son's good behaviour. The Arabic sources are unanimous in presenting Umar's father as encouraging his son to rebel nonetheless. The town of Barasht (Bresk) and the isles of Kerkennah fell to Roger, as did the unruly desert tribes. After the brief period of conquest and acquisition, "the dominion of the Franks [Normans] extended from Tripoli to the borders of Tunis, and from the western Maghrib to Qayrawan".
After the Almohads took the city of Bougie, upon which Roger may have had designs, in 1152, a fleet under Philip of Mahdia was sent to conquer Bône. According to Ibn al-Athīr, Philip was a secret Muslim who treated the inhabitants of Bône gently.
Submission of Tunis and internal unrest
Roger became involved in a war with Byzantium after 1148, and so was unable to follow up his conquests with an attack on Tunis. In fear, the Tunisians sent grain to Sicily in hopes of averting an attack, according to Ibn Idhari. This should probably be seen as tribute and submission, since Ibn Idhar writes that Roger was still in power in the city when the Almohads attacked it in 1159, although he was in fact dead. The Venetian chronicler Andrea Dandolo is probably correct in asserting: "and the kings of Tunis paid him [Roger] tribute" (regemque Tunixii sibi tributarium fecit). Roger died in 1154, and was succeeded by his son William I, who continued to rule Africa. His accession was taken for an opportunity by the native officials, who clamoured for more powers to tax. The Arabic historians Ibn al-Athīr and Ibn Khaldun, both hoped that Roger would defend his African lands against Almohad extremism and intolerance. After his death, some Muslim officials demanded that sermons be preached against the Almohads in the mosques.
The inhabitants of Africa, overwhelmingly Muslim by this time, generally preferred Muslim rule to Christian, and as the Almohads advanced eastward, William I's native governors made contacts with his Moroccan foes. The local uprisings in favour of the Almohads were well-organised, and Ibn al-Athīr and Ibn Khaldun connect them with the contemporaneous Sicilian uprising engineered by Maio of Bari. Among the rebels was Umar ibn al-Husayn al-Furrīānī, and among the cities lost was Zawīla, a suburb of Mahdia. It was reconquered, and served as a place of refuge for Christians escaping Almohad persecution in the last days of Norman Africa.
After having regained his authority William sent the fleet against Tinnīs in Egypt (c.1156), which Roger may have attacked as early as 1153/4. In 1157/8—the chronology of these events is difficult to establish—a Sicilian fleet raided Ibiza in the Muslim Balearics. The Italian Arabist Michele Amari suggested that this last was an endeavour to interrupt the Almohads' shipping routes, but Ibiza lies well to the north of the African coast. From Ibiza the fleet had to come to the aid of Mahdia, which was under threat from Almohad forces.
All of Norman Africa was essentially abandoned to the Almohads save Mahdia. Tripoli fell in 1158, and Mahdia was under siege from late in the summer of 1159. In response to the Almohad caliph's question, "Why did you ever abandon so strongly-fortified a place as that?", al-Hasan, who was in his camp, is said to have replied, "Because I had few in whom I could place my trust; because food was lacking; and because it was the will of fate." In response, Caliph Abd al-Mū‘min is said to have temporarily abandoned the siege in order to construct two large mounds of wheat and barley. Sfax, which had been in revolt against William for some time, accepted Almohad overlordship during the siege, while the city of Gabès was taken by force. In January 1160 Mahdia was breached and Abd al-Mū‘min gave its remaining Christians and Jews the option of Islam or death.
Hugo Falcandus blamed the fall of Africa, and the resulting persecution of African Christians, on William I and Maio of Bari's intransigence. A final peace with the Almohads was not signed until 1180, when a Sicilian naval vessel intercepted a ship bearing the daughter of the caliph Yūsuf to Spain. According to Pietro da Eboli's Liber ad honorem Augusti, the caliph offered to pay annual tribute in return for the return of the princess. A special office, the duana de secretis, was formed in Palermo to oversee incoming tribute payments. Robert of Torigny even says that two cities, Africa (Mahdia) and Sibilia (Zawīla), were returned to them, but in fact they probably only received warehouses and commercial facilities in these places. After the treaty, the Sicilians and Almohads exhibited a shared interest in stemming the expansion of Ayyubid Egypt, and William II of Sicily turned his attention (1180–82) to the piracy of the Banū Jānīyah who ruled the Balearics and were avowed enemies of the Almohads.
Later Anglo-Norman writers refer to a one-line, rhyming poem (monosticum): APVLVS ET CALABER, SICVLVS MICHI SERVIT ET AFER ("Apulia and Calabria, Sicily and Africa serve me"). Radulphus de Diceto, in his Decani Lundoniensis Opuscula, briefly narrates the Norman conquest of southern Italy and then quotes the above line. Ralph Niger wrote that the line appeared on a seal of Roger II's, while a dubious passage in Gervase of Tilbury says that Roger had it inscribed on his sword. Andrea Dandolo referred to the legend of the sword, which was apparently well known in fourteenth-century Venice. A similar line to the monosticum appears in a mid-twelfth-century encomium on Rouen, the capital of Normandy. The anonymous poet refers to Roger II as "ruler of Italy and Sicily, Africa, Greece and Syria" and suggests that Persia, Ethiopia and Germany fear him.
There is a tradition that Roger, after conquering Africa, took the title rex Africae (King of Africa). According to C.-E. Dufourcq, however, this was a mistake first committed by eighteenth-century copyists, who mistranscribed certain charters, placing Africae in place of Apuliae. There is at least one surviving private Sicilian charter which refers to Roger as "our lord of Sicily and Italy and also of all Africa most serene and invincible king crowned by God, pious, fortunate, triumphant, always august". Royal charters universally use the title "King of Sicily, of the Duchy of Apulia, and of the Principality of Capua". One tombstone from Palermo, that of the royal priest Grizantus, dated to 1148, refers to Roger in its Arabic and Judeo-Arabic inscriptions as "king (malik) of Italy, Longobardia, Calabria, Sicily and Africa (Ifrīqiyya).
The government of Norman Africa was modelled carefully on the precedents offered by the pre-Norman emirs. As in Sicily, close attention was paid to the interests of the Muslim population, while the Christians benefit from the exemption from the poll-tax... Apart from the garrisons in the African towns, and apart from the use of Norman-style cavalry charges, evidence for the presence of 'Norman' or 'Frankish' characteristics cannot be found. The architects of the African empire were not 'Normans' but Greek and Arabic courtiers...
Control of Africa gave Sicily control of all the sea routes between the western and eastern Mediterranean. Roger II taxed shipping, although he seems to have allowed the local Muslims princelings to collect some tariffs of their own. Ibn abī-Dīnār states that the wāli of Gabès collected taxes in Roger's name. Because of Sicily's good relations with Fatimid Egypt, Italian merchant ships could travel along the entire north African shore in peace during this period. Roger also taxed the overland caravan routes from Morocco to Egypt ("Kairouan" and "caravan" are cognates.) More profitable than these were the trans-Saharan caravans carrying paiole gold dust for the mints of northern African and southern Italy. An important stopping point for these was Bougie, which Roger may have attacked during this period, but over which he could not extend authority, although he did maintain links with the deposed emir Yahyā ibn al-‘Azīz.
At Mahdia, Roger I and William I minted dinars of pure gold, 22 mm in diameter and weighing 4.15 g with Cufic inscriptions, probably for internal circulation in Africa. The only two known coins were first discovered by the Tunisian scholar H. H. Abdul-Wahab in 1930. They were a close imitation of a type minted by the Fatimid caliph az-Zāhir (1020–35) over a century earlier. These did not make use of a title, like "king", nor did they name any of Roger's domains, rather they employed language (al-Mu‘tazz bi-‘llāh, "who holds his glory of God") usually reserved by Muslims for the Amīr al-Mu‘minīn (commander of the faithful). The inscriptions on Roger's known coin are written in two concentric circles with two lines of text in the centre. The circular text is the same on both sides, while the central text differs: "This dinar was struck by order of the most respected [or excellent king] Roger, who holds his glory of God [Allah], in the city of Mahdia, in the year 543 [of the Hegira]", that is, 1148/49, in the outer circle and "Praise be to God as He merits and as it is right He should be praised" in the inner circle. The obverse centre reads "The King Roger", while the reverse centre reads "He who holds his glory from God". William's coin is dated to 549 (1154/5). It has been observed that the inscriptions bear a resemblance to those of Robert Guiscard's tarì struck at Palermo in 1072. In both cases the mint would have been staffed entirely by Muslims.
As ruler of Africa, Roger aimed to encourage Muslim refugees in Sicily to re-settle in Africa, and issued a decree to this effect. He maintained the loyalty of his African domains by offering grain. Norman Africa "became rich and prosperous, while the remainder of Barbary and the great part of the Middle East felt the harsh pangs of hunger" during this period of constant famines. According to Ibn al-Athīr, Tripoli prospered under Roger: "the Sicilians and the Rūm [the north Italians, Greeks, etc.] frequented it [for the sake of commerce], with the result that it became repopulated and prospered". Merchants from Genoa with ties to Sicily began trading with Tripoli as well.
Roger left religious and judicial authority in local hands, under a local governor (‘āmil). In each town there was a Sicilian garrison under a Sicilian commander, and a poll tax (jizyah) was instituted on the Muslim communities, similar to that which they had until then exacted from Jews and Christians, but lighter than that which was demanded of Sicilian Muslims at the same time. The local Christian community, largely servile and enslaved, probably benefited from Roger's rule for a time. Bishop Cosmas of Mahdia made a trip to Rome to be confirmed by Pope Eugene III and also to Palermo to visit his new sovereign. The anonymous continuator of Sigebert of Gembloux refers to Cosmas as returning to Africa "a free man".
When Mahdia fell to the Almohads in 1160, Cosmas fled to Palermo. The Christians seem to have suffered under Almohad rule from their association with the Sicilians. The native church in Africa is rarely mentioned after that.
- African Romance languages may have been still spoken by local Christians.
- Before it was finally conquered by the Muslims, this province was reorganised as the Byzantine exarchate of Africa.
- All the Arabic sources can be found in Michele Amari, Biblioteca arabo-sicula (Rome and Turin: 1880).
- Houben, Roger II, 83.
- Dalli, "Bridging Europe and Africa", 79.
- Abulafia, "Norman Kingdom", 26.
- Abulafia, "Norman Kingdom", 29.
- Abulafia, "Norman Kingdom", 27.
- Reported in an-Nuwayrī, Nihayat al-Arab, and Abu Muhammad Abdallah at-Tijani, Rihlah. The Cairo Geniza shows how north African trade was monopolised by Tunis and Mahdia.
- Abulafia, "Norman Kingdom", 30.
- Dalli, "Bridging Europe and Africa", 84.
- Abulafia, "Norman Kingdom", 32–33.
- Abulafia, "Norman Kingdom", 33 n. 35, quoting Ibn abī-Dīnār, Al Mu'nis fi Akhbar Ifriqya wa Tunis.
- Abulafia, "Norman Kingdom", 39, quoting Ibn Idhari, The Amazing Story.
- Abulafia, "Norman Kingdom", 39 and 40 n. 73. The passage is found in Gottfried Wilhelm Leibniz's edition in the Scriptores rerum Brunsvicensium (Hanover, 1707), i.943, but was omitted from the edition of F. Liebrecht (Hanover, 1856), who regarded it as a later interpolation.
- Abulafia, "Norman Kingdom", 39–40. For the Erfurt chronicles, see O. Holder-Egger (ed.), Monumenta Erphesfurtensia saec. XII, XIII, XIV, MGH in usus scholarum (Hanover, 1899), 42.
- Abulafia, "Norman Kingdom", 40.
- Dalli, "Bridging Europe and Africa", 78.
- Abulafia, "The Crown and the Economy", 5 n. 30. The quotation comes from Ibn al-Athīr.
- Abulafia, "Norman Kingdom", 34, quoting Ibn al-Athīr, The Complete History.
- Quoted in Abulafia, "Norman Kingdom", 34.
- Abulafia, "Norman Kingdom", 35.
- Abulafia, "Norman Kingdom", 42 n. 87.
- Abulafia, "Norman Kingdom", 37–38.
- Abulafia, "Norman Kingdom", 35, quoting Ibn al-Athīr.
- Abulafia, "Norman Kingdom", 42–43.
- Abulafia, "Norman Kingdom", 35, quoting Ibn Idhari.
- William's expedition is found in Abu‘l-Fida (Abulfeda), A Concise History of Humanity, and Roger's in Ibn al-Athīr.
- Abulafia, "Norman Kingdom", 43, quoting Ibn al-Athīr.
- This episode probably forms the basis for one of the tales in Giovanni Boccaccio's Decameron.
- Abulafia, "Norman Kingdom", 44.
- Abulafia, "Norman Kingdom", 40–41.
- Abulafia, "Norman Kingdom", 48–49.
- The poem bears resemblance in this respect to the classicising verse of Leo of Vercelli in praise of Otto III and Gregory V (c.1000), in which he notes that Africa, Syria and Greece submit to them.
- Abulafia, "Norman Kingdom", 41: Dominus noster Sycilie et Ytalie nec non et tocius Africe serenissimus et invictissimus rex a Deo coronatus pius felix triumphator semper augustus. The definitive source of Sicilian diplomas is K. A .Kehr, Die Urkunden der normannisch-sizilischen Könige (Innsbruck, 1902).
- Johns, "I titoli arabi", 43, cf. also 26.
- Abulafia, "Norman Kingdom", 47.
- Travaini, "The Normans", 191.
- Abulafia, "Norman Kingdom", 36–37.
- Grierson and Travaini, Medieval European Coinage, 120.
- Abulafia, "Norman Kingdom", 36, quoting Amari.
- Hamilton, The Christian World, 174.
- Abulafia, David. "L'attività commerciale genovese nell'Africa normanna: la città di Tripoli." Atti del Congresso internazionale di studi sulla Sicilia normanna (Palermo: 1973): 395–402.
- Abulafia, David. "The Crown and the Economy under Roger II and His Successors". Dumbarton Oaks Papers 37 (1983): 1–14.
- Abulafia, David. "The Norman Kingdom of Africa and the Norman Expeditions to Majorca and the Muslim Mediterranean". Anglo-Norman Studies 7 (1985): 26–49.
- Abdul-Wahab, H. H. "Deux dinars normands de Mahdia". Revue tunisienne 1 (1930): 215–18.
- Dalli, Charles. "Bridging Europe and Africa: Norman Sicily's Other Kingdom". Bridging the Gaps: Sources, Methodology and Approaches to Religion in History. Joaquim Carvalho, ed. (Pisa: Pisa University Press, 2008): 77–93.
- Belkhodja, Khaled. "Roger II en Ifriqiya". Africa, fasc. 1 (Tunis: Institut national d'archéologie et d'art, 1966): 111–17.
- Brett, Michael. "Ifriqiya as a Market for Saharan Trade from the Tenth to the Twelfth Century AD." Journal of African Studies 10 (1969): 347–64.
- Grierson, Philip and Lucia Travaini. Medieval European Coinage 14, Italy III (South Italy, Sicily, Sardinia). Cambridge: Cambridge University Press, 1998.
- Hamilton, Bernard. The Christian World of the Middle Ages. BCA, 2003.
- Houben, Hubert. Roger II of Sicily: A Ruler Between East and West. G. A. Loud and D. Milbourn, trans. Cambridge: Cambridge University Press, 2002.
- Johns, Jeremy. "I titoli arabi dei sovrani normanni di Sicilia" Bollettino di Numismatica 6–7 (1986): 11–54.
- Johns, Jeremy. "Malik Ifrīqiya: The Norman Kingdom of Africa and the Fāṭimids". Libyan Studies 18 (1987): 89–101.
- King, Matthew. The Norman Kingdom of Africa and the Medieval Mediterranean. PhD diss. University of Minnesota. 2018.
- Metcalfe, Alex. The Muslims of Medieval Italy. Edinburgh: Edinburgh University Press, 2009.
- Travaini, Lucia. "The Normans between Byzantium and the Islamic World". Dumbarton Oaks Papers 55 (2001): 179–96 .
- Wieruszowski, Helen. "Roger II of Sicily, Rex-Tyrannus in Twelfth-century Political Thought". Speculum 38 (1963): 46–78.