Since everyones seems to want to repeat the first poster i'll join in(i just want to be cool)
Mainimarcco, god of worms.
Manimarco, Formerly King of Worms, Now God of Worms.
Formerly a contemporary and scholar of Artaeum along with Galerion the mystic. While Galerion founded the mages guild, Manimarco spent his time and magical affinities toward the study of reanimation of the dead, and like Galerion, threw off many of the older social mores which mitigated what the "Proper" use of magick was. Unlike Galerion, who decided that "McMagick" should be available to anyone with enough coin, however, (Thus throwing off the notion that practitioners of magick should be steeped in the knowledge of what that magick actually does deep behind the scenes.) Manimarco threw off the social mores that it was abhorrent to resurrect the dead for personal gain.
Hence his rivalry against Arkay, the god associated with mortal life/death, and rebirth. Rituals and prayers done in the name of Arkay can render it impossible to reanimate a corpse, and to steal a mortal's soul without the explicit permission of said mortal being granted first. This is the crux of the document cited-- "Arkay the enemy"
In many ways, Galerion and Mannimarco could be argued to have been very very similar. This is quite likely the origin of their rivalry, even in their days as students at Artaeum.