Časlav was Prince of the Serbs from c. 933 until his death in c. 943/960.

The House of Vlastimirović was the first Serbian royal dynasty, named after Prince Vlastimir, who was recognized by the Byzantine Empire. The dynasty was established with the Unknown Archon, who ruled during the reign of Emperor Heraclius (610–641). The Vlastimirović dynasty ruled in Serbia until the 940s/960s, when some of the Serbian lands were annexed by the Byzantine Empire.