B. 1287, s. of Edmund de Mortimer; m. Joan, da. of Piers de Geneville, c.1306; cr. earl of March, Oct. 1328; d. 29 Nov. 1330; bur. Shrewsbury(?).
Mortimer succeeded his father, a marcher baron, in 1304 at the age of seventeen. From 1316 to 1318 he served as the king's lieutenant in Ireland. On his return, he engaged in disputes over land with the Despensers, favourites of Edward II, and in 1322 was placed in the Tower of London under threat of execution. He made a daring escape in August 1324 and fled to France, where he became the lover of Edward's estranged queen, Isabella. Together they launched a successful invasion in September 1326, executed the Despensers, and proclaimed prince Edward king as Edward III. The deposed king was murdered in September 1327 at Berkeley castle. From 1327 Mortimer and Isabella ruled England on behalf of the young king. They took most of the estates of the Despensers, and in 1328 Mortimer was created earl of March. In October 1330 the young king launched his own coup, surprising Mortimer in Nottingham castle. He was attainted for treason and hanged at Tyburn.
Subjects: British History.