threat in the Serb consolidation, and opted to subjugate them in the midst of the conquest of Slav lands. Another reason might have been that the Byzantines wanted to divert attention in order to cope with the Slav Uprising in the Peloponnese, and so sent the Serbs to instigate the war. Presian invaded Serbian territory in 839. The invasion led to a 3-year war, in which Vlastimir was victorious; Presian was driven out of Serbian territory by Vlastimir's army. In addition to making no territorial gains, Presian suffered heavy losses due to the Serbian tactical advantage in the hills. The war ended with the death of Theophilos in 842, which released Vlastimir from his obligations to the Byzantine Empire. Presian died in 852, and was succeeded by his son Boris I. Honour Presian Ridge on Livingston Island in the South Shetland Islands, Antarctica, is named after Presian I of Bulgaria. See also Bulgars History of Bulgaria Presian Inscription References Sources Jordan Andreev, Ivan Lazarov, Plamen Pavlov, Koj koj e v srednovekovna Bălgarija, Sofia 1999. Vasil Zlatarski, Istorija na bălgarskata dăržava, 1:1, Sofia, 1918. (primary source), Bahši Iman, Džagfar Tarihy, vol. III, Orenburg 1997. De Administrando Imperio by Constantine Porphyrogenitus, edited by Gy. Moravcsik and translated by R. J. H. Jenkins, Dumbarton Oaks Center for Byzantine Studies, Washington D. C., 1993 852 deaths 9th-century Bulgarian monarchs Year of birth unknown Bulgarian people of the Byzantine–Bulgarian Wars People of the Bulgarian–Serbian Wars Krum's dynasty