Henry IV of England Henry IV of England Henry IV (15 April 1367 – 20 March 1413), also known as Henry Bolingbroke (), was King of England from 1399 to 1413, and asserted the claim of his grandfather, Edward III (himself a maternal grandson of Philip IV of France), to the Kingdom of France. Henry was born at Bolingbroke Castle in Lincolnshire. His father, John of Gaunt (1340-1399) (created 1st Duke of Lancaster in right of his wife), was the fourth son (third to survive to adulthood) of King Edward III and enjoyed a position of considerable influence during much of the reign of
Henry IV of England his nephew King Richard II (1377-1399) whom Henry eventually deposed. Henry's mother was Blanche of Lancaster, heiress to the great Lancashire estates of her father Henry of Grosmont, 1st Duke of Lancaster (a descendant in the male line of King Henry III). Henry, having succeeded his father as 2nd Duke of Lancaster, when he became king thus founded the Lancaster branch of the Plantagenet English monarchy. He was also the first King of England since the Norman Conquest whose mother tongue was English rather than French. One of Henry's elder sisters, Philippa of Lancaster, married King John I of Portugal,