Ciirta is an Imperial heretic mage who resides in the Shivering Isles, and is the leader of the Apostles. They are located in the old fort The Howling Halls. Ciirta is one of the few people in the Shivering Isles that has knowledge of the secret of Sheogorath, although she misinterpreted Sheogorath's absence. Ciirta mistakenly believed that Sheogorath had abandoned the Realm out of fear of Jyggalag and his Forces of Order, not understanding the true nature of the Greymarch.
Sometime after the previous Greymarch, Ciirta began to collect a cult of followers known as the Apostles of Light. Ciirta and her apostles were dedicated to overthrowing Sheogorath, who they believed had abandoned them. The cult soon grew large enough to launch a rebellion against the Madgod. The rebellion was utterly crushed by the Dark Seducers of Dementia. The Seducers slaughtered all but Ciirta, who was brought before Sheogorath and exiled for her trouble.
After her exile, Ciirta began to recreate the Apostles of light in the land of Dementia. A group of dedicated followers stole the stones of the Howling Halls, which was the asylum that housed the mad Emperor Pelagius III. The halls would become the base of the Apostles, where they would begin to plan the next uprising against Sheogorath and store relics of great importance, like the Pelvis of Pelagius III.
The Hero will encounter her while gathering items for a replica of the Staff of Sheogorath. Her eye, which has seen secrets no other mortal has, is needed to complete the staff. She and her personal guard Luminary Kaz will attack the Hero and defend themselves until death.