William, Henry was born in 21 August 1765 to the king of England, George III at Buckingham House. He was baptized on 20 September 1765. He joined the royal navy at the age of 13, as a midshipman. He served in the battle of Cape St. Vincent.
In 1785, he became a lieutenant and was transferred to the West Indies. He wanted to be a duke like his older brothers, but his father refused. He had an affair with a woman named Doro Jordan from 1791, and she mothered 10 children of his. In 1820 when his father died he became second in line for him to be king. In 1827, he became the first when his older brother died. And in 1830 June 26th when one of his older brothers died too, he became king and was crowned in 8 September, 1831.