Mortimer

Family from the Welsh Marches, who acquired Dunamase in Leinster, Ireland, in 1247 and the lordship of Trim in 1308. Roger Mortimer, 1st Earl of March (died 1330), served as lieutenant to the English crown in Ireland, as did several of his heirs. In 1368 the 3rd Earl, Edmund Mortimer (died 1381), inherited the de Burgh claim to Connacht and Ulster through marriage to King Edward III's granddaughter Philippa, heiress to the territories. Though frequently absent from Ireland because of their prominent role in English affairs, they sought hard to exploit their Irish lands, but the line came to an end with the death of Edmund Mortimer, 5th Earl of March and 8th Earl of Ulster (1391–1425), and their vast Irish estate eventually became vested in the crown in 1461.