On the 12 October 1814. He became the third British monarch of the House of Hanover
He 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
He was part of the German Royal Family called The House of Hannover.
King George III was of the House of Hanover.
George III (1738-1820) was King of Great Britain from 1760 to 1820.
Hanover
His Grandson King George III.
Answer King George III of Great Britain's full names were George William Frederick. He belonged to the Royal House of Hanover.
George III became the third Hanoverian King of England in 1760 on the death of his grandfather, George II.
George III, By the Grace of God, of Great Britain, France and Ireland, King, Defender of the Faith, Prince-Elector of Hanover, Duke of Brunswick
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Hanover
George III
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King George III's brother, Frederick, Duke of York, did not become king because he predeceased George III. Frederick died in 1827, while George III passed away in 1820. Following George III's death, the throne passed to his eldest son, George IV. As a result, the line of succession continued through George III's direct descendants rather than his siblings.