Roman the Great
After the death of last descendant of Principality's founders Rostislavich Brothers - Vladimir II in 1199, Halychians started negotiations with the sons of his sister (daughter of Yaroslav Osmomysl) and the legendary Prince Igor (the main hero of the poem The Tale of Igor's Campaign) about succession to the Halychian throne. But Prince of Volodymir Roman with the help of Prince Leszek the White managed to capture Halych despite a strong resistance of residents. Following next six years lasted a period of continued repression against the nobility and active citizens as well as a significant territorial and political expansion that transformed Halych in the main center of all Rus'. Volhynian principality was united with Halychian but this time the new Centre of Galicia-Volhynia principality became Halych. Further successful war with Igorevich Brothers contenders for the Galician throne enabled Roman the Great to establish his control over Kiev and place there his henchmens, one of them with the consent of Vsevolod the Big Nest. After victorious campaigns against the Cumans, and probably Lithuanians, Roman the Great reached the height of its power and was called in the annals as "The Tzar and Autocrator of all Rus'".