Prince Regent, theˌPrince ˈRegent, the 
the son of the British king, George III, who acted as king from 1811 to 1820 because his father was mentally ill. This period of British history is called ‘the Regency’. When George III died in 1820, the Prince Regent became King George IV.
the son of the British king, George III, who acted as king from 1811 to 1820 because his father was mentally ill. This period of British history is called ‘the Regency’. When George III died in 1820, the Prince Regent became King George IV.