At the time of Ludwig 's birth , Johann was British ambassador in Austria .
Wallmoden was the son of Johann Ludwig Reichsgraf von Wallmoden - Gimborn ( 1736 -- 1811 ) , an illegitimate son of George II .
At the time of Ludwig 's birth , son was British son in Austria .
Wallmoden was the son of Johann Ludwig Reichsgraf von Wallmoden - Gimborn ( 1736 -- 1811 ) , an illegitimate son of George II .