Boris Vyacheslavich

Boris Vyacheslavich
Prince of Chernigov
Reign	1077
Predecessor	Vsevolod Yaroslavich
Successor	Vsevolod Yaroslavich
Died	3 October 1078 (KIA) Nezhatina Field
Dynasty	Rurik
Father	Vyacheslav Yaroslavich

Boris Vyacheslavich (Russian: Борис Вячеславич) was Prince of Chernigov for eight days in 1077. He was the son of Vyacheslav Yaroslavich, Prince of Smolensk. Following his father's death in 1057, the child Boris was debarred from his inheritance. He died fighting against his uncles—Vsevolod Yaroslavich, Prince of Chernigov and Izyaslav Yaroslavich, Grand Prince of Kiev—on 3 October 1078.

Boris was the son of Vyacheslav Yaroslavich, Prince of Smolensk, a younger son of Yaroslav the Wise, Grand Prince of Kiev. According to the historian Martin Dimnik, Boris was a child when his father died in 1057. Boris became an izgoi—a member of the Rurik dynasty debarred from ruling—after his father's death, because his uncle, Igor Yaroslavich succeeded his father in Smolensk. Boris's allegedly close relationship with his cousins, Oleg Svyatoslavich and Roman Svyatoslavich implies that their father, Sviatoslav Iaroslavich, Prince of Chernigov appeased Boris "in some manner, undoubtedly, by giving him a town", according to Martin.

Upon the death of Sviatoslav Yaroslavich in 1077, his brothers Vsevolod Yaroslavich and Izyaslav Yaroslavich started a bitter rivalry over the Kievan throne. Vsevolod left Chernigov and headed towards Izyaslav, who had set out on a military campaign against Kiev. Boris took advantage of his uncle's absence and seized control of Chernigov. He only managed to remain in power for eight days and then had to flee to Tmutarakan upon hearing the news of Vsevolod's return.

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