Queen Victoria's grandfathers were both commoners.
George III ( George William Frederick ; 4 June 1738 -- 29 January 1820 ) was King of Great Britain and Ireland from 25 October 1760 until the union of the two countries on 1 January 1801 , after which he was King of the United Kingdom of Great Britain and Ireland until his death . Queen Victoria . Victoria was the daughter of Prince Edward , Duke of Kent and Strathearn , the fourth son of King George III .