 Complete the following phrase:  Mstislav II Svyatoslavich c. 1168  31 May 1223 was a Rus prince a member of the Rurik dynasty. His baptismal name was Panteleymon. He was probably prince of Kozelsk 11941223, of Novgorod-Seversk 12061219, and of Chernigov 121512201223. He was killed in the 