Iron Wolf Jarulf is a NPC in Diablo III. He is part of the Iron Wolves, and asks the player to help him kill several of Maghda's cultists.
Jarulf (Pedro Faria) was the maker of "Jarulf’s Guide to Diablo and Hellfire", known by the community as the most in-depth guide for the original Diablo game.
He also appears in Diablo II, as one of the possible names for the Act III Iron Wolf hireling.