Edmund Mortimer English knight (1306–1331) Parents Roger Mortimer, 1st Earl of March Joan de Geneville, 2nd Baroness Geneville Children Roger Mortimer, 2nd Earl of March Siblings Agnes Mortimer, Countess of Pembroke Katherine Mortimer, Countess of Warwick Margaret Mortimer Maud Mortimer Joan Mortimer Beatrice Mortimer Geoffrey Mortimer John Mortimer Elinor ferch Roger Mortimer Blanche Mortimer Roger Mortimer Isabella Mortimer Partners Elizabeth de Badlesmere, Countess of Northampton