Tag this record Born / Died Birth Date: 0-00-00Death Date: 1274-08-10 Parents Mother: Briouze, Maud de ( - 1300/1)Father: Mortimer, Roger de (1225 - 1282) Siblings Male Mortimer, Edmund de (1252 - 1304) Mortimer, Roger de (1256 - 1326) Mortimer, William de ( - 1297) Female Mortimer, Margaret de ( - 1297) Mortimer, Isabel de ( - 1300) Titles Details of Offices Bibliographic Sources View a list of abbreviations. Oxford Dictionary of National Biography.