BBC: George III (1738 - 1820): Biography of the monarch during who's reign Britain lost its American colonies but emerged as a leading power in Europe.
George III: Biography for the king of Great Britain and Ireland (1760–1820); son of Frederick Louis, prince of Wales, and grandson of George II, whom he succeeded.
George III of the United Kingdom - Wikipedia: Article covers early life, reign and later years.
Kids' Zone: George III: Profile of George III for children.