[2] Noted for successfully curbing the privileges of the landowning boyar class in Rostov-Suzdal and his ambitious building programme, Yuri transformed this principality into the independent power that would evolve into early modern Muscovy.[citation needed] Although he twice managed to briefly hold Kiev (in September 1149 – April 1151, again in March 1155 – May 1157) and rule as Grand Prince of Kiev, his autocratic rule and perceived foreigner status made him unpopular with the powerful Kievan boyars, leading to his presumed poisoning and the expulsion of his son (later Andrei Bogoliubsky of Vladimir-Suzdal) in 1157.[citation needed] His rule marked the effective end of the Rus' as a unified entity until the Mongol invasions, with powerful provincial territories like Vladimir-Suzdal and Galicia-Volhynia now competing for the throne of Kiev.[citation needed] In 1108 Vladimir Monomakh sent his young son Yuri to govern in his name the vast Vladimir-Suzdal principality in the north-east of Kievan Rus'.[citation needed] In 1147 Yuri Dolgorukiy had a meeting with Sviatoslav Olgovich (then prince of Belgorod Kievsky) in a place called Moscow.After presumably being poisoned at the feast of a Kievan nobleman, Yuri unexpectedly died in 1157 which sparked anti-Suzdalian uprising in Kiev.[citation needed] Yuri Dolgoruki was interred at the Saviour Church in Berestovo, Kiev, but his tomb is empty.