Henry IV (c. April 1367 – 20 March 1413), also known as Henry Bolingbroke, was King of England from 1399 to 1413. Henry's grandfather, Edward III, had begun the Hundred Years War by claiming the French throne, in opposition to the House of Valois, a claim that Henry would continue during his reign. However, unlike his forebears, Henry was the first English ruler whose mother tongue was English (rather than French) since the Norman Conquest, over three hundred years before.