Bilhorod Kyivskyi
In the 13th century after the Mongol invasion of Rus' Bilhorod degraded and after destruction of Kyiv in 1240 Bilhorod ceased to exist . 
<triplet> Vsevolod II of Kiev <subj> Sviatoslav Olgovich <obj> sibling <triplet> Sviatoslav Olgovich <subj> Vsevolod II of Kiev <obj> sibling