The First Swedish Crusade was a possibly mythical military expedition around 1150 that has traditionally been seen as the conquest of Finland by Sweden, with pagan Finns converting to Christianity. According to the legend, the crusade was conducted by King Eric IX of Sweden. Bishop Henry of Uppsala accompanied him and remained in Finland later to become a martyr there. The Swedish bishop normally involved in the eastern campaigns was the Bishop of Linköping, not the Bishop of Uppsala.