Board Thread:Lore Discussion/@comment-193.34.160.16-20150717153103/@comment-25350022-20150805113858

I think all mortals within the Shivering Isles were residents of Nirn, including the Duke and Duchess of Mania and Dementia, both were wood elves. They must have been granted access through the gates of madness. Hence, they were not killed by the Gatekeeper.

Only creations of Sheogorath were possibly the Golden Saints, Dark Seducers, and the abominations found in and around the Isles, Gnarls, Hungers, Grummites etc. To name a few...