"the odious Prinny, George IV"

George IV painted during his regency by Thomas Lawrence
Public DomainGeorge IV painted during his regency by Thomas Lawrence

George IV (1762-1830) was Prince Regent during the madness of his father, King George III and ascended to the throne following his death in 1820.  His adulteries, extravagant lifestyle and illegal marriage to a Catholic shocked his subjects.  The Regency style of architecture and interior design is "light and graceful", as described here.