Dyus

Dyus is a male Imperial who will help you assume the Throne of Madness in the quest "Symbols of Office."

In the quest you seek to assemble a new Staff of Sheogorath, Haskill recommends you to see Dyus at Knifepoint Hollow. Dyus tells you that you need the Eye of Ciirta and a branch from the Tree of Shades. Once you have both items, you return to Dyus. He will create the unfinished Staff for you. He then tells you to travel to Tree of Madness in Sheogorath's throne room and tap the Tree's power to complete the staff.

Dyus was the former keeper of the Great Library of Jyggalag as well as Jyggalag's trusted Chamberlain. Within the library, it listed formulaic predictions of the actions, events and deeds of all sentient lifeforms (creature, mortal and Daedra) in existence, that previously existed or is to be existing using the logical formula found withing the library. When Sheogorath appeared, he destroyed the library, seeing it as an abomination as he viewed that personal choice outlawed logical prediction. Sheogorath destroyed everything except for Dyus, seeing that he couldn't bring himself to destroy him due to the knowledge he posessed. So Sheogorath imprisoned Dyus inside Knifepoint Hollow and granted him immortality, seeing that he wouldn't die within his prison.