William IV, the 'Sailor King', reigned for just seven years. Rash and impetuous as a young man, he was sent to join the navy by his father, George III, to bring him to order, but he was overpromoted at an early age and saw his years of active service marked by a series of calamities. He was also notorious for his mounting debts and his long relationship with the actress Mrs Jordan, with whom he had ten children. Yet, as Roger Knight, one...