George III was the King of Great Britain and Ireland from 1760 until 1820. He was born on June 4, 1738, and became king at the age of 22. His reign saw significant events, including the American Revolutionary War, which led to the loss of the American colonies. George III is often remembered for his struggles with mental health, which affected his ability to govern. Despite the challenges he faced, George III was a patron of the arts and sciences. He supported the establishment of the Royal Academy of Arts and was interested in agriculture and botany. His long reign made him one of the longest-serving monarchs in British history.