10th and 11th centuries. These were the Olgoviches of Severia who ruled in Chernigov, Yuryeviches who controlled Vladimir-Suzdal, and Romanoviches in Galicia-Volhynia. Descendants of Sviatoslav II of Kiev The Olgoviches descended from Oleg I of Chernigov, a son of Sviatoslav II of Kiev and grandson of Yaroslav the Wise. They continued to rule until the early 14th century when they were torn apart by the emerging Grand Duchy of Lithuania and Grand Duchy of Moscow. The line continued through Oleg's son Vsevolod II of Kiev, grandson Sviatoslav III of Kiev, great-grandson Vsevolod IV of Kiev and great-great-grandson Michael of Chernigov, from whose sons the extant lines of the Olegoviches are descended, including the Massalsky, Gorchakov, Baryatinsky, Volkonsky and Obolensky, including Repnin. Descendants of Vsevolod I of Kiev Vsevolod I of Kiev was the father of Vladimir II Monomakh, giving rise to the name Monomakh for his progeny. Two of Vladimir II's sons were Mstislav I of Kiev and Yuri Dolgorukiy. The Romanoviches (Izyaslavichi of Volhynia) were the line of Roman the Great, descended from Mstislav I of Kiev through his son Iziaslav II of Kiev and his grandson Mstislav II of Kiev, father of Roman the Great. The older Monomakhovychi line that ruled the Principality of Volhynia were eventually crowned kings of Galicia and Volhynia and ruled until 1323. The Romanovychi displaced the older line of Izyaslavychi from Turov and Volhynia as well as Rostyslavychi from Galicia. The last were two brothers of Romanovychi, Andrew and Lev II, who ruled jointly and were slain trying to repel Mongol incursions. The Polish king, Władysław I the Elbow-high, in his letter to the Pope wrote with regret: "The two last Ruthenian kings, that had been firm shields for Poland from the Tatars, left this world and after their death Poland is directly under Tatar threat." Losing their leadership role, the Rurikids, however, continued to play a vital role in the Grand Duchy of Lithuania and the later Polish–Lithuanian Commonwealth. Most notably, the Ostrogski family held the title of Grand Hetman of Lithuania and strove to preserve the Ruthenian language and Eastern Orthodoxy in this part of Europe. It is thought that the Drutsk and related princely families may also descend from Roman the Great. The Rostislaviches were the line of Rostislav I of Kiev, another son of Mstislav I of Kiev, who was Prince of Smolensk and a progenitor of the lines