Margaret of Windsor1346 - 1361 Born Wed, 20 July 1346 Windsor Castle, Windsor Died Fri, 25 December 1361 Buried Abingdon Abbey, Abingdon Details Parents Countess of Pembroke Margaret Lived 15 years, 5 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 Mary of Waltham 1344 - 1361 Brother Thomas of Windsor 1347 - 1348 Brother William of Windsor 1348 Brother Thomas of Woodstock 1355 - 1397