Umbacano is a wealthy altmer mage living in the Imperial City. He owns a manor with many servants, his steward Jollring and four guards. You’ll need to speak with Jollring if you wish to see him.
Umbacano is an avid collector of Ayleid artifacts, paying well for statues from their ruins and has great admiration for the Ayleids. He has a pro-Ayleid opinion of the fall of the White Gold Tower calling the human victory a "brutal sack". Umbacano desires to wield the power of the Ayleids and restore their fallen empire.
Umbacano first appeared in Morrowind along with Sorcalin (who is mentioned in dialogue in Oblivion) in the Yassu Mine.