Historically, there was significant conflict between the Christian religion and the native Nordic religions. Of course early on the vikings did a lot of raiding of Christian nations, later however Christianity spread into the region. During this time there was a lot of conflict between the two religions, though obviously Christianity ended up converting or killing most followers of the old religion. This is a commonly recurring theme in Amon Amarth songs. In this case the song pretty clearly states that it is about an early Christian missionary, presumably to Scandanavia but which of the Nordic countries makes little difference. (I think the events are pretty clear from here on out)
Historically, there was significant conflict between the Christian religion and the native Nordic religions. Of course early on the vikings did a lot of raiding of Christian nations, later however Christianity spread into the region. During this time there was a lot of conflict between the two religions, though obviously Christianity ended up converting or killing most followers of the old religion. This is a commonly recurring theme in Amon Amarth songs. In this case the song pretty clearly states that it is about an early Christian missionary, presumably to Scandanavia but which of the Nordic countries makes little difference. (I think the events are pretty clear from here on out)