Britain's King George III dies at age 81, on January 29, 1820 and his eldest son, George, Prince of Wales, ascends to the throne as King George IV. George III had suffered years of mental illness and his son had already ruled as Prince Regent since 1811 due to his father's incapacity.
George IV reigned for ten years until his own death in 1830. He was succeeded by his younger brother, William IV, since George had no legitimate surviving children.