Battle of Achelous (917)

Battle Of Achelous (917)

Coordinates: 42°38′35″N 27°38′12″E / 42.64306°N 27.63667°E / 42.64306; 27.63667

The Battle of Achelous or Acheloos (Bulgarian: Битката при Ахелой, Greek: Μάχη του Αχελώου), also known as the Battle of Anchialus, took place on 20 August 917, on the Achelous river near the Bulgarian Black Sea coast, close to the fortress Tuthom (modern Pomorie) between Bulgarian and Byzantine forces. The result of the battle was a decisive Bulgarian victory which not only secured the previous successes of Simeon I but made him de facto a ruler of the whole Balkan Peninsula excluding the well-protected Byzantine capital Constantinople and the Peloponnese.

The battle of Achelous was one of the worst disasters that ever befell a Byzantine army, and conversely one of the greatest military successes of Bulgaria. Among the most significant consequences was the official recognition of the Imperial title of the Bulgarian monarchs, and the consequent affirmation of Bulgarian equality vis-à-vis Byzantium.