基辅大公
Mstislav was the fourth of five sons (and the eighth of nine children) of Rostislav Mstislavich, who was briefly Grand Prince of Kiev in 1167. Mstislav himself married twice; his first wife was a daughter of Iaroslav Iziaslavich of Volynia (and later Grand Prince of Kiev), while his second wife, whom he married sometime before 1176, was a daughter of Gleb Rostislavich of Riazan.