King George III (Washington Dynasty)

Born in 1832 Prince George Washington Custis, named for his grandfather King George II would become the King George III in 1873.

Prince George
George Washington Custis married in 1865 to Princess Helena of the Kingdom of England, the daughter of then-Queen Victoria of England. It was a politically motivated marriage meant to ease tensions between the United States and the reconstituted Kingdom of England.

King George III
In 1873 when his mother Queen Mary I died King George III was crowned King of the United States.