Siwardus was a

Bishop of Uppsala The Archbishop of Uppsala (spelled Upsala until the early 20th century) has been the primate (bishop), primate of Sweden in an unbroken succession since 1164, first during the Roman Catholic Church, Catholic era, and from the 1530s and onward un ...

in the 1140s. He was probably the same person as the Sverinius who is mentioned as the first Bishop of Uppsala in an early 15th-century ''Incerti scriptorts Sueci chronicon primorumin ecclesia Upsalensi archiepiscoporum'', chronicle of Uppsala archbishops. Historical sources mention Siwardus in 1142 and 1143. Siwardus apparently died in a monastery in

Oldenburg Oldenburg may also refer to: Places *Mount Oldenburg, Ellsworth Land, Antarctica *Oldenburg (city), an independent city in Lower Saxony, Germany **Oldenburg (district), a district historically in Oldenburg Free State and now in Lower Saxony *Olde ...

in 1159 after being exiled from Uppsala by local heathens sometime earlier. There were plans to have him canonized as a saint, which never took place.

References

Roman Catholic archbishops of Uppsala 12th-century Roman Catholic bishops in Sweden Year of birth unknown Year of death unknown {{RC-archbishop-stub