Fornsigtuna (forn means ancient), Old Sigtuna, Sithun, Sign(h)ildsberg or Signesberg (Håtuna approximately 4 kilometres (2.5 mi) west of the modern town of Sigtuna, by Lake Mälaren in Sweden. Although the location is nearly forgotten, it has a central role in Norse mythology.) is located in the parish of
- Odin took up his residence at the Maelare lake, at the place now called Old Sigtun. There he erected a large temple, where there were sacrifices according to the customs of the Asaland people. He appropriated to himself the whole of that district, and called it Sigtun. To the temple priests he gave also domains. Njord dwelt in Noatun, Freyr in Upsala, Heimdal in the Himinbergs, Thor in Thrudvang, Balder in Breidablik; to all of them he gave good estates.
Later the pirate Sölve arrived at Old Sigtuna to claim the Swedish throne:
- Solve came unexpectedly in the night on Eystein (Östen), surrounded the house in which the king was, and burned him and all his court. Then Solve went to Sigtun, and desired that the Swedes should receive him, and give him the title of king; but they collected an army, and tried to defend the country against him, on which there was a great battle, that lasted, according to report, eleven days. There King Solve was victorious, and was afterwards king of the Swedish dominions for a long time, until at last the Swedes betrayed him, and he was killed.
- King Olaf steered thereafter eastwards to Svithjod, and into the Lag (the Mælar lake), and ravaged the land on both sides. He sailed all the way up to Sigtuna, and laid his ships close to the old Sigtuna. The Swedes say the stone-heaps are still to be seen which Olaf had laid under the ends of the gangways from the shore to the ships.
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- They likewise held the god Frey to be the founder of their race. Amongst these from the town of Sigtun also came Sigmund, a champion advocate, versed in making contracts of sale and purchase; besides him Frosti surnamed Bowl: allied with him was Alf the Lofty (Proud?) from the district of Upsala; this man was a swift spear-thrower, and used to go in the front of the battle.
There are two large ruins that had been two large three-aisled halls, a series of terraces just above the shore-line of the Germanic Iron Age, traces of a harbour, a large mound and a number of smaller grave fields. Excavations have dated the remains to the Vendel Age, part of the Germanic Iron Age, and the Viking age, i.e., from the 6th century until the 11th century.
It was an Iron Age and mediaeval royal estate (see Uppsala öd) and it was located strategically at the waterway to Old Uppsala and the Temple at Uppsala. In the 10th century, the name was transferred to modern Sigtuna, which apparently assumed many of its functions.
- It is mentioned in the 1170s when Pope Alexander III addresses king Knut Eriksson and Jarl Birger Brosa (Svenskt Diplomatarium I nr 852. Originalbrev). The pope demands that they return to the archbishop of Uppsala (until 1270 the name referred to Gamla Uppsala) the villages Strom (Ström in the parish of Norrsunda), Fornesitune and Guazbro (probably Vadsbro). The villages had earlier belonged to the bishop of Sigtuna, but they had been confiscated by the crown when the bishopric had been moved to Gamla Uppsala.
- In 1299, Birger Magnusson, the son of Magnus Ladulås, spent some time in Old Sigtuna as one of his letters was written in Sightonia Antiqua (in Malmberg, Ernst: Svenska slott och herresäten) or apud antiquam Sightoniam The difference seems to be a matter of presenting the name in the nominal case or preserving the case in which the name appeared in the original text.
- In 1315, according to Svenskt Diplomatarium (SD) III nr 2032 (s.228), Erik Magnusson was bestowed a part of Old Sigtuna, which is called Siktonia vetus (vetus being Latin for "old"). Neighbouring properties are also named: Norgungi (Norränge in Håtuna) and Frötunum (Frötuna in Håbo-Tibble)
- In 1541, according to Kammar-ark.: jordeböcker, Uppland 1541 nr 5, the location is named as one of Gustav I Vasa's estates and spelled Forsictuna, Foorsictuna and Fforssiiktwna (in Malmberg, Ernst: Svenska slott och herresäten).
- In 1542, according to Gustav Vasas jordebok are mentioned Foorsictuna and Norringe (Norränge)
- In 1551, according to Sven Nielssons jordebok för Stäkets län, it is mentioned as the royal estate of Forsictuna (Malmberg, Ernst: Svenska slott och herresäten and Friesen: Om staden Sigtunas ålder).
- In 1567, it is mentioned as Foder Sictuna in the province of Uppland
- In the 17th century, the name Försigtuna is used on a map (Lantmät.verk. Gävle).
Since the 17th century, the location has been a manor named Signhildsberg or Signesberg.
- The Heimskringla; or, Chronicle of the Kings of Norway: Translated from the Icelandic of Snorro Sturleson, with a preliminary dissertation, tr. Samuel Laing, 3 volumes, London: Longman, 1844, OCLC 504839499, Volume 1, p. 220
- Ynglinga saga ch. 31, Laing tr. p. 246.
- Ólafs saga helga ch. 4, Laing tr. Volume 2, p. 4.
- Lausavísur, Hjálmarr inn hugumstóri, at Skaldic Arts.
- Peter Tunstall, The Saga of Hervor & King Heidrek the Wise, 2003.
- Magnússflokkr Archived 2011-03-30 at the Wayback Machine, at Skaldic Arts.
- Poem about Harald Hardrada, at Skaldic Arts.
- Magnússdrápa Archived 2011-03-30 at the Wayback Machine, at Skaldic Arts.
- The First Nine Books of the Danish History of Saxo Grammaticus: With some considerations on Saxo's sources, historical methods, and folk-lore, tr. Oliver Elton with Frederick York Powell, Publications of the Folk-Lore Society 33, London: Nutt, 1894, p. 313.
- Friesen: Om staden Sigtunas ålder
- Malmberg, Ernst: Svenska slott och herresäten
- Jonas Ros: Sigtuna och folklanden : den tidiga Sigtunamyntningen och den politiska (Fornvännen 2002(97):3, s. -175)