Igor II Olgovich was Prince of Chernigov and Grand Prince of Kiev (1146). He was a son of Oleg I of Chernigov.
He was the chosen successor of his brother, Vsevolod II of Kiev. Though his brother had extracted promises of loyalty from his Kievan subjects, Igor and his family, the Olgovichi, were unpopular and there was resistance against his accession. The chroniclers accused Igor of being dishonest, greedy, scheming, and violent. He had reigned less than two weeks before the Kievans invited his cousin and rival, Iziaslav II, to be their prince. Reneging on a promise he had made not to seek power, Iziaslav attacked and defeated Igor.
Igor was captured and thrown into a pit by Iziaslav. He languished there until the autumn of 1146, when, desperately ill, he asked permission to become a monk at St. Theodore's Monastery in kyiv under the name Ignati. In 1147, a mob attacked and killed Igor under the mistaken impression that he was trying to usurp the throne from Iziaslav. His body was dragged behind a cart and displayed at a market.
Miracles were alleged to have occurred around Igor's body, and he was proclaimed a saint-martyr.