Lady Elizabeth De Burgh
From A Compendium of Irish Biography, 1878
De Burgh, Lady Elizabeth, only child and heiress of preceding, born in 1332, married in 1352, Lionel, son of Edward III., who became in her right 4th Earl of Ulster and Lord of Connaught. Her daughter Philippa, wife of Edmund Mortimer, was ancestor of Edward IV. and subsequent British sovereigns. [See CLARENCE, DUKE OF.]
52. Burke, Sir Bernard: Dormant, Abeyant, Forfeited, and Extinct Peerages. London, 1866.