St Leger St Leger, 1st Viscount Doneraile, 2nd creation (born St Leger Aldworth; died 15 May 1787) was an Anglo-Irish politician and peer, who was a member of Parliament for Doneraile from 1749 to 1776. He is known for his conviction for assaulting a Catholic priest, and for challenging the prosecuting counsel, John Philpot Curran, to a duel.