The battle took place in the valley between the mountains of Belasitsa and Ograzhden near the modern Bulgarian village of Klyuch.
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Skylitzes records that Basil completely routed the Bulgarian army and took 15,000 prisoners (14,000 according to Kekaumenos).
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The Battle of Kleidion (or Clidium, after the medieval name of the village of Klyuch, "(the) key"; also known as the Battle of Belasitsa) took place on July 29, 1014 between the Bulgarian Empire and the Byzantine Empire.
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July 29 – Battle of Kleidion: Basil II inflicts not only a decisive defeat on the Bulgarian army, but his subsequent blinding of 15,000 prisoners reportedly causes Tsar Samuil of Bulgaria to die of shock, and earns Basil II the sobriquet 'Boulgaroktonos' (Bulgar-slayer).