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According to black Dutch researcher Egmond Codfried and author of the book "Belle van Zuylen's forgotten grandmother" there was black nobility in Europe, but there history and images were later carefully tucked away.
"Nègre Joyeux Dansant le "CakeWalk" in "Black Europe", The first comprehensive documentation of the sounds and images of black people in Europe pre-1927
Stepanida Stepanivna Yakovlev, daughter of Sawa Yakovlev (Sobakin) of St Petersburg. Her father was a businessman, breeder, philanthropist, and one of the richest men of his time, who was elevated to the Russian nobility in the mid-1700's. From Art of Medieval and Renaissance era Blacks in Europe