Yuri Dolgorukiy
Yuri I Dolgorukiy, literally - "Yuri the Long-Armed" (Old Ruthenian: Гюрьги, Дюрьги, Gyurgi; born as Yuri Vladimirovich (Russian: Юрий Владимирович), also known as George I of Rus', (c. 1099 – 15 May 1157) and was the founder of Moscow and a key figure in the transition of political power from Kiev to Suzdal following the death of his elder brother Mstislav the Great. He reigned as Velikiy Kniaz (Grand Prince) of Kiev from September 1149 to April 1151 and then again from March 1155 to May 1157.
Read more about Yuri Dolgorukiy: Problems in Identifying Birthdate, Activities in Rostov and Suzdal, Struggle For Kiev, Marriages and Children, Ancestors, Memorials, Succession