Roger Mortimer, 1st Earl of March

Roger Mortimer, 1st Earl of March (1287–1330), was a marcher lord. His 1301 marriage to Joan de Geneville won him Welsh March and Irish lands, and he became Lord Lieutenant of Ireland in 1316. He led the marcher lords against Edward II and was imprisoned in the Tower in 1322, but escaped to France.

He allied with Queen Isabella; their 1326 invasion deposed Edward, whose murder at Berkeley Castle Mortimer allegedly arranged. He ruled in young Edward III's name until seized at Nottingham in 1330 and hanged at Tyburn.