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Male Duke Oleg Feodosij Svyatoslavich of Chernigov Click to view Duke Oleg Feodosij Svyatoslavich of Chernigov in the family tree

Oleg was born in 1147 in Chernigov, Ukraine.1   Oleg's father was Grand Duke Svyatoslav Vsevolodovich of Kiev III and his mother was Princess Mariya Vasilkovna of Polotsk.  His paternal grandparents were Grand Duke Vsevolod Yurij Olegovich of Kiev and Chernigov II and Princess Mariya Agafiya Mstislavna of Kiev; his maternal grandparents were Duke Vasilko Svyatoslavich of Polotsk I and <Unknown>. He had five brothers and two sisters, named Boris, Vladimir, Chermnij, Gleb, Mstislav, Boleslava and Mariya.  He was the second oldest of the eight children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=bevangenealogy&id=I33665

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