It is not known who inherited prince Časlav, or what were the circumstances in Serbia in this period. With the death of Časlav in c. 950-c. 960 and Constantine VII Porphyrogenitus in 959, information about area of the former Vlastimirović Serbia faded. When the new Byzantine emperor John I Tzimiskes effectively crushed Bulgarian empire in 971, the Byzantine ("Roman") paramount rule stretched to the Danube again, for the first time in over three centuries. That way, Serbian lands came under the direct governance of the Byzantine Empire.