Wizards, Witches and Beings: Y
An inner circle Death Eater who, like Lucius Malfoy and Avery, was never captured and sent to Azkaban (HBP2, (DH1). Consequently, he was in a position of trust at the Ministry and well-placed for Voldemort's takeover in 1997 (DH1) and served as a high official in the Ministry while the Death Eaters were in charge.
High level or not, he had trouble with his office raining (DH12). He sat on the Muggle-Born Registration Commission with Umbridge (DH13) and managed to grab hold of Hermione when she was Apparating, and ended up inside the Fidelius Charm around Number 12 Grimmauld Place (DH14).
During the fighting in the Entrance Hall during the Battle of Hogwarts, Yaxley dueled with Flitwick. After the lull while everyone though Harry was killed, the battle resumed and this time Yaxley was taken out by George Weasley and Lee Jordan (DH36).
Name origin: Lysander is a boy's name meaning "liberator
Possibly an ancestor of the Death Eater Yaxley.