Saxo Grammaticus writes in Book 8 of Gesta Danorum that Sigmund, one of the warriors of the House of Yngling, came from what is chronologically Old Sigtuna to fight at the Battle of Bråvalla:
- 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.
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