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Phillipa Plantagenet, (16 August 1355 - 5 January 1380/1), Countess of Ulster suo juris, was the daughter and only child of Lionel of Antwerp, Duke of Clarence, the third son of King Edward III of England. As a result of her seniority in the line of succession to the throne of England and her marriage into the powerful Mortimer family, her descendants eventually succeeded to the throne as the House of York under Edward IV.
She married Edmund Mortimer, 3rd Earl of March in 1368, an alliance that would have far-reaching consequences in English history.
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