Who was the male parent of XXX?
Gustav Ernst von Stackelberg
Graf Gustav Ernst von Stackelberg (Russian: Густав Оттонович Стакельберг) (born 5 June 1766 in Reval, Governorate of Estonia, died 18 April 1850 in Paris, France) was a Russian diplomat of Baltic-German descent, and was the son of Otto Magnus von Stackelberg.
Otto Magnus von Stackelberg