1762–1830, king of Great Britain and Ireland and also of Hanover (1820–30); regent (1811–20). His father (George III) disapproved of his profligate ways, which undermined the prestige of the crown, and of his association with the Whig opposition
George IV in American English
noun
1762–1830, king of Great Britain and Ireland 1820–30 (son of George III)