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.
was King of Great Britain and King of Ireland from 25 October 1760 until the union of these two countries on 1 January 1801, after which he was King of the United Kingdom of Great Britain and Ireland until his death.
A succession of European wars expanded his German domains during his lifetime, and in 1708 he was ratified as prince-elector of Hanover. At the age of 54, after the death of Queen Anne of Great Britain, George ascended the British throne as the first monarch of the House of Hanover.