William IV King of the United Kingdom of Great Britain and Ireland, King of Hanover, 26 June 1830 – 20 June 1837

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Historical Images Archive / Alamy Stock Photo
Image ID: K6WN6N
Illustration from The Life and Times of Queen Victoria published circa 1901. Info from wiki: His reign saw several reforms: the poor law was updated, child labour restricted, slavery abolished in nearly all of the British Empire, and the British electoral system refashioned by the Reform Act 1832. Although William did not engage in politics as much as his brother or his father, he was the last monarch to appoint a prime minister contrary to the will of Parliament.