Mstislav Svyatoslavich of Rylsk (? - 1241) - Prince of Rylsk (after 1191 -1241), the son of Svyatoslav Olgovich, a participant in the Polovtsian campaign in 1185 and one of the heroes of The Tale of Igor's Campaign .
Mstislav Svyatoslavich rules the Principality of Rylsk after his father's death. It can be assumed that Mstislav, along with his elder brother Oleg Svyatoslavich of Kursk (c1185-c1230) and other Princes of Chernigov and Princes of Novgorod-Seversky, took part in the Battle of the Kalka River (1223). In 1241, after the Mongol invasion of the Principality of Chernigov and before Batu Khan's return from the campaign to Central Europe, was killed by the Mongols  under unknown circumstances.
Marriage and children
Nothing is known about Mstislav's wife.
He had two sons :
|Offspring of Mstislav Svyatoslavich of Kursk and Nomen nescio|
|Andrei Mstislavich of Rylsk (c1220-c1245)||1220||1245|
|Oleg Mstislavich of Rylsk (c1226-c1285)|