Mary of Waltham1344 - 1361 Born Sat, 10 October 1344 Bishop's Waltham Palace, Bishop's Waltham Died Tue, 15 September 1361 Buried Abingdon Abbey, Abingdon Details Parents Duchess of Brittany Mary Lived 16 years, 11 months, 5 days father Edward III 1312 - 1377 mother Philippa of Hainault 1310 - 1369 Siblings Brother Edward the Black Prince 1330 - 1376 Sister Isabella of England 1332 - 1382 Sister Joan of England 1333 - 1348 Brother William of Hatfield 1336 - 1337 Brother Lionel of Antwerp 1338 - 1368 Brother John of Gaunt 1340 - 1399 Brother Edmund of Langley 1341 - 1402 Sister Blanche of the Tower 1342 Sister Margaret of Windsor 1346 - 1361 Brother Thomas of Windsor 1347 - 1348 Brother William of Windsor 1348 Brother Thomas of Woodstock 1355 - 1397