Corban Yaxley

Yaxley is a Death Eater mentioned briefly by Severus Snape in Harry Potter and the Half-Blood Prince. Not much is known about him, but in book seven he is revealed to be one of the Death Eaters that attacked Hogwarts in Half-Blood Prince. He was most likely the Death Eater Harry stunned on top of the Astronomy Tower, after Dumbledore's murder.

In the Deathly Hallows, he breaks out of Azkaban at the beginning of the story because he is seen at the meeting of the Death Eaters at Malfoy Manor. He is the new Head of the Department of Magical Law Enforcement after the fall of the Ministry of Magic, its previous head Pius Thicknesse having become the puppet Minister after Yaxley had placed him under the Imperius Curse.

He fails in stopping Harry, Hermione and Ron when they escape the Ministry of Magic in DH and was captured after DH (defeated in battle by Lee Jordan and George Weasley).