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Constantine Porphyrogenitus wrote in his work On Administering the Empire that the Khagan and the Bek of the Khazars asked the Emperor Teophilos to have the fortress of Sarkel built for them.
The biographical notices, the author avers, are condensed from the Onomatologion or Pinax of Hesychius of Miletus; other sources include the excerpts of Constantine Porphyrogenitus, the chronicle of Georgius Monachus, the biographies of Diogenes Laertius and the works of Athenaeus and Philostratus.