Ernest Augustus I (5 June 1771 – 18 November 1851) was King of Hanover from 20 June 1837 until his death. He was the fifth son and eighth child of George III, who reigned in both the United Kingdom and Hanover. As a fifth son, initially Ernest seemed unlikely to become a monarch, but Salic Law, which barred women from the succession, applied in Hanover and none of his older brothers had legitimate male issue. Therefore, he became King of Hanover when his niece, Victoria, became Queen of the United Kingdom, ending the personal union between Britain and Hanover that had existed since 1714.