Who dated Charles II, Duke of Brunswick?

Charles II, Duke of Brunswick (German: Karl II, Herzog von Braunschweig; 30 October 1804 – 18 August 1873), ruled the Duchy of Brunswick from 1815 until 1830. Today he is best remembered for being on the losing side of the "Opera Game," defeated by American chess master Paul Morphy in one of the most famous chess games ever played.