Czar Boris II of Bulgaria, the son of Czar Bulgaria ruled for three years (969_972).

Boris was captured by the invading Rus in 969 and made a puppet ruler for Kyivan Rus. In order to keep the Kyivans from cementing their hold in the region, the Byzantines under Emeperor John I Tzimisces invaded Bulgaria and attacked the forces of Prince Sviatoslav of Kyiv in 972. The Byzantines drove the Rus to the Danube and forced Sviatoslav to abandon Bulgaria. Boris was forced to step down from the throne and annexed eastern Bulgaria. Tzimiskes also reduced the autonomy of the Bulgarian Orthodox Church by reducing the head of the church from patriarch to an archbishop and making him subservient to the patriarch of Constantinople.