Tag this record Born / Died Birth Date: 1328-11-11Death Date: 1360-02-26 Parents Marriages/Other Unions Montagu, Philippa ( - 1381/2)Type: marriageUnion began: 1352Union ended: n.d. Offspring From Montagu, Philippa ( - 1381/2)Male offspring: Mortimer, Edmund de (1351/2 - 1381) Primary Title 2nd Earl March Titles 2nd Earl MarchAssumed: 1354Vacated: 1360 Details of Offices Bibliographic Sources View a list of abbreviations. The Complete Peerage of England, Scotland, Ireland, Great Britain, and the United Kingdom. 1887–98 (8 vols); 1910–59 (13 vols). 6 vols. Gloucester: Alan Sutton, 1982 Oxford Dictionary of National Biography.