Boris Vyacheslavich

Boris Vyacheslavich (c. 1056–1078) was the son of Vyacheslav Yaroslavich, prince of Smolensk, and a grandson of Yaroslav the Wise. Left an izgoi prince excluded from his inheritance after 1057, he vanishes from the chronicles until 4 May 1077, when he seized Chernigov while its prince Vsevolod was away; he held it only eight days before fleeing to Tmutarakan.

In summer 1078, with Oleg Svyatoslavich's backing, he defeated Vsevolod and retook Chernigov. On 3 October 1078 he fell fighting Vsevolod and Grand Prince Izyaslav near Chernigov.