Philippa, 5th Countess of Ulster
| Philippa of Clarence | |
|---|---|
| Countess of Ulster Countess of March |
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Arms of Philippa of Clarence, 5th Countess of Ulster
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| Born |
16 August 1355 Eltham Palace, Kent |
| Died | 5 January 1382 (aged 26) Cork, Ireland |
| Burial | Wigmore, Herefordshire |
| Spouse | Edmund Mortimer, 3rd Earl of March |
| Issue |
Elizabeth Mortimer, Lady Camoys Roger Mortimer, 4th Earl of March Philippa Mortimer, Countess of Pembroke and Arundel Sir Edmund Mortimer Sir John de Mortimer |
| House | Plantagenet |
| Father | Lionel of Antwerp, 1st Duke of Clarence |
| Mother | Elizabeth de Burgh, Countess of Ulster |
Philippa of Clarence (16 August 1355 – 5 January 1382) was the suo jure Countess of Ulster.
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 third son, but second son to survive infancy, of King Edward III of England and Philippa of Hainault.
Philippa married Edmund Mortimer, 3rd Earl of March, in 1368 at the age of thirteen in the Queen's Chapel at Reading Abbey, an alliance that would have far-reaching consequences in English history. Her cousin, King Richard II remained childless, making 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 its descent from Edward III through his granddaughter Philippa of Clarence. Philippa was Anne Mortimer's grandmother.
Philippa died in 1378, and was buried at Wigmore Abbey, Herefordshire.
Her children with Edmund Mortimer were as follows:
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