George, Grand Duke of Mecklenburg ruled the state of MecklenburgStrelitz from 1816 until his death.
Duke George Frederick Charles Joseph of Mecklenburg was born in Hanover, the eighth child of Charles II, Grand Duke of MecklenburgStrelitz, and his first wife Princess Friederike of HesseDarmstadt. Following the death of his mother in 1782 his father married her sister Charlotte two years later in 1784 and the family moved from Hanover to Darmstadt. George remained in Darmstadt until 1794, when his father succeeded as the ruling Duke of MecklenburgStrelitz and George accompanied his father to Neustrelitz.
Source: Wikipedia