She was born at
Eltham Palace in Kent on 16 August 1355, the only child of
Lionel of Antwerp, 1st Duke of Clarence, and
Elizabeth de Burgh, 4th Countess of Ulster. Her father was the second surviving son of King
Edward III of England and
Philippa of Hainault. She was the eldest grandchild of King Edward and Queen Philippa, her namesake. Philippa married
Edmund Mortimer, 3rd Earl of March, at the age of fourteen, in the Queen's Chapel at
Reading Abbey. Her cousin, King
Richard II, remaining childless, made Philippa and her descendants next in line to the throne until his deposition. In the
Wars of the Roses, the
Yorkist claim to the crown was based on descent from Edward III through Philippa, her son
Roger Mortimer, and granddaughter
Anne Mortimer, who married
Richard of Conisburgh, 3rd Earl of Cambridge, a son of her uncle
Edmund of Langley, 1st Duke of York. Philippa died in around 1377. The precise date of her death is unknown, but Philippa had certainly died by December 1379. Her date of death is often confused with that of her mother-in-law, who died in January 1382. Philippa was buried at
Wigmore Abbey, Herefordshire. ==Marriage and issue==