'He had brought nothing but trouble to the navy: how would he fare as King?'

Known as the 'Sailor King', William IV was sent to join the navy by his father to discipline him, but instead became notorious for his calamitous years of service, his debts and his relationship with the actress Mrs Jordan. Yet, as Roger Knight's biography shows, William also helped see the country through the great constitutional crisis of its age, enabling the smooth succession of his niece Victoria.

Roger Knight was Deputy Director of the National Maritime Museum until 2000, and now teaches at the Greenwich Maritime Institute at the University of Greenwich. His previous books for Allen Lane/Penguin are The Pursuit of Victory: The Life and Achievement of Horatio Nelson, which won the Duke of Westminster's Medal for Military History, the Mountbatten Award and the Anderson Medal of the Society for Nautical Research, and Britain Against Napoleon: The Organization of Victory, 1793-1815.