george iv (born as george augustus frederick on 12 august 1762, died on 26 june 1830) was king of the united kingdom of great britain and ireland and hanover from 29 january 1820 until his death. the regency, george's nine-year time as "prince regent", which started in 1811 and ended with george iii's death in 1820, included winning the napoleonic wars in europe. george iv's only daughter died before he did, so his younger brother became king william iv of the united kingdom.