George IV (1762-1830) had served as Prince Regent for ten years, from 1810, before he became King in 1820.
He is known for having led an extravagant lifestyle, reflected in the extreme fashions of the Regency era. He was outwardly charming and cultured and liked nothing better than leisure pursuits and deciding what was "good taste"! It was George IV who built the Royal Pavilion in Brighton, enlarged Buckingham Palace, and rebuilt Windsor Castle. However, his extravagance and overindulgence - and his poor relationship with his father and wife - did not make him popular with the people, who lost respect both for him and for the monarchy itself. Rather than acting as a role model and leader during the Napoleonic Wars, he was known as being selfish, rude and irresponsible!
He wasn't much interested in affairs of State and the country was run by Parliament under Prime Minister Lord Liverpool for most of his reign.
George IV's only child, Princess Charlotte, died before him in 1817. He was succeeded by his younger brother, William.