House of York

The House of York was a cadet branch of the English royal House of Plantagenet. Three of its members became Kings of England in the late 15th century. The House of York was descended in the male line from Edmund of Langley, 1st Duke of York, the fourth surviving son of Edward III, but also represented Edward's senior line, being cognatic descendants of Lionel, Duke of Clarence, Edward III's second surviving son. It is based on these descents that they claimed the English crown. Compared with the House of Lancaster, it had a senior claim to the throne of England according to cognatic primogeniture but junior claim according to the agnatic primogeniture. The reign of this dynasty ended with the death of Richard III of England in 1485. It became extinct in the male line with the death of Edward Plantagenet, 17th Earl of Warwick in 1499.

Descent from Edward III

Edmund of Langley, 1st Duke of York, 1st Earl of Cambridge, KG (5 June 1341 – 1 August 1402) was a younger son of King Edward III of England and Philippa of Hainault, the fourth of their five sons who lived to adulthood. He was the founder of the House of York, but it was through the marriage of his younger son, Richard to Anne Mortimer that the Yorkist faction in the Wars of the Roses made its claim on the throne. The other party in the Wars of the Roses, the Lancasters, were descendants of Edmund's elder brother, John of Gaunt whose son Henry usurped the throne of Richard II in 1399.