1295 - 1345
| Father | Hugh de Mortimer |
| Mother | Matilda |
| Husband | Geoffrey de Cornwall |
| Children | Richard, Geoffrey, John, Joan, Matilda |
Margaret was born about 14th September 1295, the daughter of Hugh and Maud. She had an older sister Joan (1). If there were any other siblings, then they must have died before her father, who died in or shortly before August 1304 (2)(3), possibly as a result of being poisoned by his wife, Margaret's mother (4).
She was initially made a ward of Queen Margaret (20)(21)(5), but soon afterwards her wardship was sold to Walter, bishop of Coventry & Lichfield (22)(5). Sometime between August 1305 (5), and the death of her mother, about February 1308 (6)(7)(8)(9), she married Geoffrey de Cornwall (8). Later that year her "half-great uncle", William (apparently the illegitimate son of her great grandfather), died (23) and she came into a further inheritence (24). Her eldest (known) son, Richard, was born about 1313 (15). She also had a son Geoffrey (11), and may have had another son John (13), and daughters Joan and Matilda (14). Her husband, Geoffrey, died in 1335 (15)(16). She remarried soon afterwards to William de Everois, but this marriage was shortlived, as he died in 1337. Following his death, Margaret had to take legal action to ensure that her inheritence, the barony of Burford, went to her son Richard, rather than to the heir of William De Everois (17)(18) Margaret died shortly before Christmas 1345 (19)Brief details of her children: