King of Britain for sixty years and the last king of what would become the United States, George III inspired both hatred and loyalty and is now best known for two reasons: as a villainous tyrant for America's Founding Fathers, and for his madness, both of which have been portrayed on stage and screen. In this concise and penetrating biography, Jeremy Black turns away from the image-making and back to the archives, and instead locates George's life within his age: as a king who faced the loss of key colonies, rebellion in Ireland, insurrection in London, constitutional crisis in Britain and an existential threat from Revolutionary France as part of modern Britain's longest period of war.