This is from their second album:
They'd go back and forth between black and Viking metal until the frontman (who I believe plays everything but I could be wrong) died and Bathory ended or broke up (the latter assuming they were more than a one-man band).
There was a video for "One Rode to Asa Bay" (off Hammerheart, same as "Shores in Flames, their only video, I think:
I'm doing Steely Dan next discography run. Short catalogue, supposed to be great though I haven't liked any of their songs I've heard.