Philippa de Coucy, Countess of Oxford, Duchess of Ireland (before 18 April 1367 – 24 September 1411) was a first cousin of King Richard II of England and the wife of his favourite, Robert de Vere, 9th Earl of Oxford, Marquess of Dublin, Duke of Ireland.

[1] Philippa was born at Eltham Palace shortly before 18 April 1367,[2] the younger daughter of Enguerrand VII, Lord of Coucy, by his wife Isabella, eldest daughter of King Edward III of England.

In 1371, at the age of four, she was betrothed to Robert de Vere, who was himself only five years older and was already Earl of Oxford.

Her husband quickly became a favourite of the young King Richard, and some suspected a homosexual relationship.

[3] In 1387, de Vere repudiated Philippa and Pope Urban VI granted him a divorce.