Humphrey of Lancaster, 1st Duke of Gloucester, 1st Earl of Pembroke,
KG (3 October 1390 – 23 February 1447), was "son, brother and uncle of kings", being the fourth and youngest son of King
Henry IV of England by his first wife,
Mary de Bohun, brother to King
Henry V of England, and uncle to the latter's son, King
Henry VI of England.