The alliance between the Persians and the…

The alliance between the Persians and the Western Turks has, inevitably, become a source of possible friction, and the Western Turks have sometimes acted as an ally of Constantinople in the war that had begun in 572.

The Turks, angered by the Romans’ treaty with the Avars, not only break off their alliance with Constantinople in 576 but also seize a Roman stronghold in the Crimea.