Presian (Bulgarian: Пресиян, Персиян, Пресиан) was the Khan of Bulgaria from 836–852. He ruled during an extensive expansion in Macedonia.
The composite picture of the Byzantine sources indicates that Presian I was the son of Zvinitsa (Zbēnitzēs), who was a son of Omurtag. In several older studies Presian is identified with his short-lived predecessor Malamir and it is assumed that this single character survived until the 850s as the direct predecessor of Boris I. This is very unlikely, as Malamir is attested as having been succeeded by his nephew (the son of his brother Zvinitsa), while Boris I was preceded by his father Presian. Zlatarski resolved the problems in the fragmentary sources by determining that Malamir’s unnamed nephew and successor was in fact Presian, and Boris I was the latter’s son.
The 17th century Volga Bulgar compilation Cäğfär Taríxı, a work of disputed authenticity, represents Birdžihan (i.e., Presian) as the son of Sabanša (i.e., Zvinitsa), which may lend support to the interpretation of his origins now dominant in Bulgarian historiography.
Presian may have been young and inexperienced at the time of his accession, and state affairs may have been dominated by the minister (Kavkhan) Isbul, as under Presian's uncle Malamir. Soon after Presian's accession the Slavs in the vicinity of Thessalonica rebelled against the Byzantine Empire in 837. Emperor Theophilos sought Bulgarian support in putting down the rebellion, but simultaneously arranged for his fleet to sail through the Danube delta and undertake a clandestine evacuation of some of the Byzantine captives settled in trans-Danubian Bulgaria by Krum and Omurtag.
Bulgaria under Presian
In retaliation Isbul campaigned along the Aegean coasts of Thrace and Macedonia and captured the city of Philippi, where he set up a surviving memorial inscription set up in a local church. Isbul's campaign may have resulted in the establishment of Bulgarian suzerainty over the Slavic tribe of the Smolyani.
Presian's reign coincides with the extension of Bulgarian control over the Slavic tribes in and around Macedonia. It is known that the Serbs and Bulgars lived in peace until the invasion in 839 (the last years of Theophilos). Vlastimir, the Knez of Serbia, united several Serbian tribes, and Emperor Theophilos (r. 829–842) granted the Serbs independence, thus the Serbs acknowledged nominal overlordship of the Emperor. The annexation of western Macedonia by the Bulgars changed the political situation, Malamir or Presian may have seen a threat in the Serb consolidation, and opted to subjugate them in midst of the conquest of Slav lands. Another cause might have been that the Byzantines wanted to divert the attention so that they could cope with the Slav Uprising in the Peloponnese, meaning they would have sent the Serbs to instigate the war. Presian invades Serbian territory between 839–842 (see Bulgarian–Serbian Wars). The invasion led to a 3-year war, Vlastimir was victorious; Presian made no territorial gains, was heavily defeated and lost many of his men as the Serbs had a tactical advantage in the hills, Presian was driven out by the army of Vlastimir. The war ended with the death of Theophilos in 842, which released Vlastimir from his obligations to the Byzantine Empire.
He died in 852, and was succeeded by his son Boris I.
Presian Ridge on Livingston Island in the South Shetland Islands, Antarctica is named after Presian I of Bulgaria.