Astrid Arkham

Astrid Arkham was the daughter of Jeremiah Arkham raised in Arkham Asylum surrounded by it's inmates. As a young woman she took up the alias of the Arkham Knight and founded the Order of the Sun, a cult dedicated to destroying Batman.

Astrid's super-villain persona originated in the video-game Batman: Arkham Knight although in it the knight had a different true-identity. She is however the first incarnation of the Arkham Knight in mainstream comics, first appearing in Detective Comics #1000.