In 1054 he received the Volyn Principality in his father’s will. In 1057, after the death of Vyacheslav Yaroslavich in Smolensk, he was transferred by three senior Yaroslavichs there (Volyn received the eldest of the grandchildren of Yaroslav the Wise, the outcast Rostislav Vladimirovich). A few years later, Rostislav fled to Tmutarakan, and Volhynia passed into the possession of Izyaslav of Kyiv.
Like his brother Vyacheslav, Igor died at an early age – in 1060, according to the Tale of Bygone Years. At the time of his death, he was about 24 years old. He, like Vyacheslav, left young sons: Davyd and Vsevolod. His children became outcast princes and, by decision of the elder Yaroslavichs, did not receive their father’s inheritance.
Igor Yaroslavich was buried “in the teremec” of the Chernigov Transfiguration Cathedral, otherwise – in the tower, which is now called the Red Terem.
There is evidence of Jan Dlugosh, the authenticity of which is questioned, that Igor Yaroslavich helped the Polish king Boleslav II the Bold when he came to Russia together with the Grand Prince Izyaslav Yaroslavich.wikipedia