Charles II was ruler of the state of Mecklenburg-Strelitz from 1794 until his death. Originally ruling as duke, he was raised to the rank of grand duke in 1815. Prior to succeeding to the throne, he served as Governor of Hanover from 1776 to 1786.

The Grand Duchy of Mecklenburg-Strelitz was a territory in Northern Germany, held by the younger line of the House of Mecklenburg residing in Neustrelitz. Like the neighbouring Grand Duchy of Mecklenburg-Schwerin, it was a sovereign member state of the German Confederation and became a federated state of the North German Confederation and finally of the German Empire upon the unification in 1871. After World War I and the German Revolution of 1918–19 it was succeeded by the Free State of Mecklenburg-Strelitz.