Edmund de Mortimer, 3d earl of March and 1st earl of Ulster
Mortimer, Edmund de, 3d earl of March and 1st earl of Ulster (də
môrˈtĭmər) [key], 1351–81, English nobleman. He succeeded (1360)
his father, Roger, 2d earl of March, married (1368) Philippa,
daughter of Edward III's son Lionel, duke of Clarence, and on
Lionel's death (1368) inherited his estates and the title of
earl of Ulster. Later the house of York (see York, house of)
traced part of its claim to the throne to this union. Mortimer
held the office of marshal of England from 1369 to 1377 and
supported the party that opposed John of Gaunt. After the
accession of Richard II (1377) he was elected to the boy king's
first council. In 1379 he was sent as lieutenant of Ireland to
subdue Irish unrest. His daughter Elizabeth married Sir Henry
Percy, known as Hotspur. More on Edmund de 3d earl of March and
1st earl of Ulster Mortimer from Fact Monster: See more
Encyclopedia articles on: British and Irish History: Biographies