Regardless of where he is now, this is where Olaf fell.
Other stories say otherwise. His body, revered, was secreted away, and ultimately soon reappeared near Trondheim. He was laid at St. Klement's, sainted, and a huge (for the time) Cathedral was built. This was for political reasons, to firm up the Norwegian Christian cause, the Danish Christians having been expelled eventually; and provide an ideology to unify Norwegians, but not for saintly behavior. Conversions to Christianity were seldom voluntary or legal, but punitive, coercive, on pain of death. Irony.