returning from his victory, Igor visited the shrine of SS. Boris and Gleb in Vyshgorod (today Vyshhorod in Ukraine) to celebrate their feast. There he met with Roman I Rostislavich of Kiev (his brother-in-law) and his brothers on July 25. Their meeting was political in nature in that Igor would have pledged allegiance to the new ruler of Kiev. Prince of Novgorod-Seversk His half-brother, Oleg Sviatoslavich died on January 16, 1180; thus Igor left Putivl to succeed him in Novgorod Severskiy. Soon after Oleg Sviatoslavich's death, grand prince Sviatoslav III Vsevolodovich of Kiev summoned Igor and Igor's brother Vsevolod Svyatoslavich to Lyubech and concluded an agreement. Svyatoslav Vsevolodovich's main objective in assembling the senior generation of Olgovichi was to secure Igor's allegiance. On September 8, Svyatoslav Vsevolodovich ordered Igor and prince Vsevolod III Yuryevich of Vladimir to lead the junior Olgovichi and Monomashichi against Vyshgorod that he was besieging; the nine-week siege of the town became a failure. At the beginning of 1181, Svyatoslav Vsevolodovich launched an expedition against Vsevolod Yuryevich in order to free from captivity his son Gleb Svyatoslavich (Prince of Chernigov). Before setting out, the grand prince commanded his son Yaroslav Svyatoslavich and Igor to remain behind and defend Chernigov against the Rostislavichi (the members of the ruling dynasty of Smolensk). Later, Yaroslav Svyatoslavich and Igor waged war on the Principality of Drutsk whose prince Gleb Rogvoldovich formed a pact with prince David Rostislavich of Smolensk. Although David Rostislavich came to assist the prince of Drutsk, but Svyatoslav Vsevolodovich, who had expanded his authority over Novgorod, made David Rostislavich flee from the field of battle and forced Gleb Rogvoldovich to capitulate. From Drutsk, Svyatoslav Vsevolodovich traveled south to evict grand prince Rurik Rostislavich from the Kievan land. Meanwhile, Igor, accompanied by Khans Konchak and Kobyak, was waiting for him near Vyshgorod. After Svyatoslav Vsevolodovich occupied the capital, the Cumans asked him to let Igor accompany them to the Lake Dolobsk. When Ryurik Rostislavich learnt that Igor and the nomads were encamped on the other side of the Dnieper River, he sent troops to attack them. His troops defeated the Cumans; Igor and Khan Konchak, however, escaped by boat to Chernigov. It is likely that Igor and Khan Konchak formed a marriage alliance and arranged their children's engagement. When Khan Konchak with his Donets Cumans pillaged the Pereyaslavl lands in February 1184, Sviatoslav Vsevolodovich sent his sons and