Grand Prince of Kiev
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.