William was born on 21 August 1765, a son of George III and Queen Charlotte. He had a naval career, served at the relief of Gibraltar and was stationed in the West Indies and Nova Scotia. He was a friend of Admiral Nelson. His elder brother died and he succeeded his father in 1830.
He married Princess Adelaide of Saxe-Meiningen at Kew Palace on 13 July 1818. They had no surviving children.
William IV and Queen Adelaide were crowned on 8 September 1831. The doors of the Abbey opened at 4am. At 10.15 the coronation procession left St James' Palace, the King dressed in an admiral's uniform and the Queen in a white and gold dress. For the first time a special lavishly furnished annexe had been built outside the west front of the Abbey to marshal the processions. The royal party arrived at 11am and the ceremony finished at 3pm. There was no coronation banquet as the King decided it was too expensive.
He died at Windsor Castle on 20 June 1837 and his niece Victoria succeeded him.He was buried at St George's chapel.
Oxford Dictionary of National Biography 2004
Music for William IV's Coronation, 1831 (PDF, 2115KB)
British Royal and State funerals.... by M. Range 2016