Mary of Waltham, Duchess of Brittany, was a daughter of King Edward III of England and Philippa of Hainault and was the wife of John IV of Brittany, known in England as "John V" and "The Conqueror". Mary was made a Lady of the Garter in 1378.
- Occupation
- aristocrat
- Position held
- Duke Consort
- Citizenship
- Kingdom of England, Duchy of Brittany
- Born
- October 10, 1344, 1344
- Died
- September 1361, 1362
