Henry IV (15 April 1367 – 20 March 1413), also known as Henry Bolingbroke (), was King of England from 1399 to 1413. He asserted the claim of his grandfather King Edward III, a maternal grandson of Philip IV of France, to the Kingdom of France.
Henry was the son of John of Gaunt (the fourth son of Edward III) and Blanche of Lancaster. John enjoyed a position of considerable influence during much of the reign of his nephew King Richard II, whom Henry eventually deposed. Henry founded the Lancaster branch of the House of Plantagenet. He was the first King of England since the Norman Conquest whose mother tongue was English rather than French.