House of Plantagenet
Blanche of Lancaster (25 March 1342 – 12 September 1368) was a member of the English royal House of Plantagenet and the daughter of the kingdom's wealthiest and most powerful peer, Henry of Grosmont, 1st Duke of Lancaster. She was the first wife of John of Gaunt, the mother of King Henry IV, and the grandmother of King Henry V of England.