Agafia was the daughter of Svyatoslav III Igorevich and his wife Yaroslava Rurikovna, a daughter of prince Rurik Rostislavich of Belgorod.
Rurik Rostislavich, grand prince of Kiev
Rostislav took part in the siege of Kiev on January 2, 1203, when Rurik Rostislavich (who had been expelled from the town) and the Olgovichi captured Kiev.