William of Windsor1348 - 1348 Born Mon, 24 June 1348 Windsor Castle, Windsor Died Thu, 5 September 1348 Buried Westminster Abbey, Westminster Details Parents William Lived 2 months, 12 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 Sister Margaret of Windsor 1346 - 1361 Brother Thomas of Windsor 1347 - 1348 Brother Thomas of Woodstock 1355 - 1397