Five Sigtuna bishops are known from written sources, four diocesan bishops, but it seems that apart from Adalvard most were not stationed in Sigtuna and episcopal Sigtuna was mostly unoccupied. Approximately in 1120, the Diocese of Sigtuna was indicated but not of that of Uppsala.Florenslistan över den kyrkliga stiftsindelningen i Norden circa 1120 Uppsala diocese was formed, however, in the 1130s while Sigtuna ceased to have its own bishop. The Diocese of Sigtuna formally ceased at latest when the Diocese of Uppsala was elevated to archbishopric in 1164.
