She was the third daughter of John Mohun, 2nd Baron Mohun (c.1320 – 15 September 1375), and Joan Burghersh (d. 4 October 1404), daughter of Bartholomew de Burghhersh (c.1304 – 3 August 1355), 1st Baron Burghersh, whose mother was Maud de Mortimer.
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Philippa firstly wife of Walter FitzWalter Lord FitzWalter.
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He married Joanne, daughter of Sir Bartholemew de Burghersh the elder, who was sister to Sir Bartholemew de Burghersh KG, one of the founders of the Garter.