- Main article: George III of the United Kingdom/In-universe
- Main article: George III of the United Kingdom/Real life
George III (George William Frederick; June 4, 1738 – January 29, 1820) was King of Great Britain and King of Ireland from October 25, 1760 until the union of these two countries on January 1, 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death. He was concurrently Duke and prince-elector of Brunswick-Lüneburg ("Hanover") in the Holy Roman Empire until his promotion to King of Hanover on 12 October 1814. He was the third British monarch of the House of Hanover, but unlike his two Hanoverian predecessors he was born in Britain, spoke English as his first language, and never visited Hanover.