|Resided in||New Sheoth|
|Appears in||Shivering Isles, Legends|
Lady Syl was a Bosmer madwoman and Duchess of Dementia at the beginning of the Greymarch of 3E 433. She resided in the House of Dementia in the Shivering Isles. Syl was known for her extreme paranoia; her madness was such that she saw plots and conspiracies everywhere, rendering her a prisoner in her own house. She is associated with two artifacts: Ruin's Edge and Nerveshatter.
At some point, Syl had a forbidden affair with Thadon, the Duke of Mania. When this controversy was discovered by her subjects, a conspiracy formed to assassinate Syl for associating with the enemy. In 3E 433, Sheogorath sent the Champion of Cyrodiil to Syl's court to become a courtier of the House of Dementia. The Champion was named Grand Inquisitor and successfully uncovered the conspiracy, which included citizens of Crucible as well as a member of Syl's Dark Seducer personal guard.
The Champion later began the Ritual of Accession to become a Duke or Duchess of Mania or Dementia, although it is unknown if the Champion chose to replace Syl or Thadon. Regardless, the surviving ruler promptly defected to Jyggalag and became a Priest of Order, betraying the Army of Sheogorath and ultimately perishing within the tunnels of the Fountainhead.