The town was newly constructed, just like many other Scandinavian towns in the Viking Age and constructed with of plots and roads of fixed size. The plots are 7-8 m wide and 30-40 m long.
The Swedish King Eric the Victorious is considered to be the founder of Sigtuna (AD 980). Sigtuna acquired municipal privileges in AD 1010.
Sigtuna existed as a royal town, Episcopal town and commercial centre for about 250 years.
See also: Sigtuna in Sweden