Original: George IV ( George Augustus Frederick ; 12 August 1762 -- 26 June 1830 ) was the King of Hanover and the United Kingdom of Great Britain and Ireland from the death of his father , George III , on 29 January 1820 until his own death ten years later .
Simplified: George IV ( born as George Augustus Frederick on August 12 1762 , died on June 26 , 1830 ) was king of the United Kingdom of Great Britain and Ireland and Hanover from 29 January 1820 until his death .