King George III was the King of Great Britain from 1760 until his death in 1820. He was the longest reigning British monarch before Queen Victoria, and he presided over many important events in British history, including the American Revolution, the Seven Years' War and the Napoleonic Wars.
King George III was born George William Frederick on June 4, 1738, in London. In 1760, at age 22, he became the King of Great Britain and Ireland following his grandfather George II's death. A year after he became king, he married Charlotte of Mecklenburg-Strelitz. The marriage was purely political strategy, and the couple only met for the first time on their wedding day.
During his reign, George III's ministers implemented a series of proclamations regarding the American colonies, which were then a territory of Great Britain. These included the Royal Proclamation of 1763, which limited the westward expansion of the colonies, as well as several other proclamations that led to George's unpopularity with the colonies and ultimately to the American Revolution.
In 1778, George began to show signs of his first bout with mental illness, which would return in 1804 and again in 1810. His illness caused deafness, blindness and dementia, eventually leading to his death in January 29th, 1820.