 In the late 15th century, historian Ericus Olai claimed that Bishop Kol of Linköping (died c. 1196) had been the "Jarl of Finland" ("Dux Finlandiae"), possibly leading Swedish troops temporarily situated in Finland.He may have been in a military role similar to that of Jon Jarl, who allegedly spent nine years overseas fighting against Novgorodians and Ingrians at the end of the 12th century.Also noteworthy is the so-called First Swedish Crusade, which, according to several 15th-century sources, took place in 1150.