29 Jan 1820—26 Jun 1830: King George IV's reign
George IV was King of the United Kingdom of Great Britain and Ireland and King of Hanover following the death of his father, King George III, on 29 January 1820, until his own death ten years later. From 1811 until his accession, he served as Prince Regent during his father's final mental illness.
George IV led an extravagant lifestyle that contributed to the fashions of the Regency era. He was a patron of new forms of leisure, style and taste. He commissioned John Nash to build the Royal Pavilion in Brighton and remodel Buckingham Palace, and Sir Jeffry Wyattville to rebuild Windsor Castle.
His charm and culture earned him the title "the first gentleman of England", but his dissolute way of life and poor relationships with his parents and his wife earned him the contempt of the people and dimmed the prestige of the monarchy.