Edmund Mortimer, 3rd Earl of March Earl of March and jure uxoris Earl of Ulster (1352-1382) (1352–1381) Parents Philippa de Montagu Roger Mortimer, 2nd Earl of March Children Elizabeth Mortimer Roger Mortimer, 4th Earl of March Edmund Mortimer Philippa de Mortimer Siblings Thomas Mortimer Roger Mortimer Margery Mortimer Janet Mortimer Partners Philippa, 5th Countess of Ulster