Annis Black was a Hag who lived in a cave in Deadmarsh, England during the late twentieth century. She wrote a letter to the Daily Prophet complaining about the paper's portrayal of Hags as flesh-eating monsters.
Behind the scenes
The name Annis Black is presumably based on the legendary Hag, Black Annis, who is said to have eaten children, and then hung their skins on the walls of her cave.