Sviatoslav I of Kiev
Some historians have tried to identify Boz with Bus mentioned in the "Tale of Igor's Campaign", in which boyars tell Sviatoslav I of Kiev (r. 945–972) of "Gothic maidens ... singing about the time of Bus", but this has been refuted. The first to connect the two was O. Ohonovskyj in 1876. He was later supported by S. Rospond.