Henry IV of England her marriage to the King of England was childless. By an unknown mistress, Henry IV had one illegitimate child: 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
Henry IV, Duke of Mecklenburg Henry IV, Duke of Mecklenburg Henry IV, Duke of Mecklenburg (1417 – 9 March 1477) was from 1422 to 1477 Duke of Mecklenburg. Henry IV of Mecklenburg, because of his obesity and lavish lifestyle also called the "Henry the Fat", was the son of the Duke John IV of Mecklenburg and Catherine of Saxe-Lauenburg. He inherited Mecklenburg when his father died in 1422. His mother, Catherine, and his uncle, Albert V, acted as Regents until 1436. He then ruled jointly with his brother John V, until his brothers death in 1442. In May 1432, he married Dorothea of Brandenburg, the