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The Catepanate of Ras (Byzantine Greek: Κατεπανίκιον Ἄρσης) was a province (catepanate) of the Byzantine Empire, established around 971 in central regions of early medieval Serbia, during the rule of Byzantine Emperor John Tzimiskes (969–976). The catepanate was named after the fortified town of Ras, eponymous for the historical region of Raška (Latin: Rascia). The province was short-lived, and collapsed soon after 976, following the Byzantine retreat from the region after the restoration of the Bulgarian Empire.
In the middle of the 6th century, during the reign of Byzantine emperor Justinian I (d. 565), a fortress of Arsa (Greek: Ἄρσα) in the province of Dardania was refortified, as attested by historian Procopius. At the beginning of the 7th century, Byzantine rule collapsed, and the region was settled by the Slavs. Up to the middle of the 10th century, the fortress of Ras was a borderline stronghold between the Principality of Serbia and First Bulgarian Empire, as attested by the Byzantine emperor and historian Constantine VII Porphyrogenitus (d. 959) in his work De Administrando Imperio.
The earliest possible date of later Byzantine invasion of Rascian region and the creation of a province is around 971, when Byzantine armies conquered Bulgaria and re-established Byzantine supreme rule over the interior of Southeastern Europe. One of the newly formed administrative units was the Catepanate of Ras. It was established as a Byzantine stronghold in Serbian lands, but its territorial jurisdiction can not be precisely determined, but Serbia probably also was conquered. The Catepanate was short-lived, as well as the Byzantine rule in the rest of Bulgarian and Serbian lands. After the death of emperor John (976), a successful uprising started in the South Slavic provinces of the Byzantine Empire, led by Cometopuli, resulting in total breakdown of Byzantine power in the region and the restoration of the Bulgarian Empire.
The main sources for the organization of the Catepanate of Ras is a seal of a strategos of Ras, dated to the reign of Byzantine Emperor John Tzimiskes (969–976). The seal belonged to protospatharios and katepano of Ras named John.
After 976, the region was dominated by the restored Bulgarian Empire, that had complex relations with neighbouring Serbian princes. Byzantine rule in the region was restored in 1018, under emperor Basil II (d. 1025), and new administrative units in Serbian lands were created, including new themes, one centered in the region of Syrmia to the north (Theme of Sirmium), and other in central Serbia (Theme of Serbia).
