Grimgroth

From the White Wolf Wiki, the most complete White Wolf reference

Grimgroth is a vampire of Clan Tremere. He is a member of the Council of Seven. He is not a founding member, having been elevated to replace the rogue Goratrix. Like all Tremere Councilors, he is responsible for furthering his Clan's interests in a broad geographical area. Originally his territory was France, in modern nights he has been given responsibility for the entirety of Western Europe. Many rumors surround this figure, including possibilities of Sabbat ties, but few facts are known for sure.

Historically, Grimgroth was present at the Fall of Mistridge in 1210 AD. In fact, it is rumored that he betrayed the wizards of Mistridge to the Craftmasons.