Vicente Valtieri
From the OblivioWiki – your guide to everything Oblivion
Vicente Valtieri is a vampiric member of the Dark Brotherhood and gives new members their first few contracts. His room is at the back, lowest part of the Cheydinhal Abandoned House. He can change you into a vampire upon ranking up to Eliminator, if you'd like.
He is killed in the mission The Purification.
