Spoilers for the Elsweyr quest, "The Connoisseur"

In Elsweyr, you can find a note called, "Reward for Stolen Wine" near Talon Gulch and the Scar's End Wayshrine. The note asks you to collect three bottles of wine which all have strange properties (described in the note) before returning them to, "Hofgrad Kjisorssen, faithful servant to his master". The first two bottles are fairly uneventful and the third bottle is near a single dead body. When you return the bottles to Hofgrad, he discusses how he's surprised you haven't completely lost your mind. For example, when you tell him that you found the third bottle by a lone dead body, he states, "Just one? The last person who returned these bottles found them under a pile of corpses. He was so affected by the wine that he purportedly spent the rest of his existence atop that mass of bodies. Fortunately, you seem to be immune to the curse." Through the course of conversation, you find out that Hofgrad himself is cursed - after having attempted to steal something from his 'Master' - to stand in this exact position in The Stitches, gathering cursed items for his Master (who collects them) in perpetuity.

Hofgrad only ever refers to his 'Master' by this title, and when you ask who it is he simply exclaims, "Never say his name, stranger. His name is more horrible than any curse."

Who could it be? I thought maybe Sheogorath, but it seemed even a little odd to fit him. Any guesses?