She who dragged the Fey to survival through the First War, and left them powerless and bound after.
Mab spent a good long time working with Notte in his emotional infancy (if one understands “working with” as “kidnapped”). Her friends – who are few – are allowed to call her May instead of Mab. Don’t try it unless she tells you you’re allowed.
She was beyond doubt the most capable, deadly female Fey Notte ever knew. Though her body is long gone, but her soul remains.
She is now The Throne.