Why did Ashurbanipal refuse to help Gyges of Lydia against the Cimmerians?

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Ashurbanipal refused to provide military assistance to Gyges of Lydia against the Cimmerian invaders because Lydian mercenaries had previously assisted Egypt in its efforts to gain independence from Assyrian rule.1

While Gyges had initially sought and received help from the Assyrians after a dream advised him to turn to Ashurbanipal, his subsequent decision to form an alliance with the Egyptian king Psamtik led to the breakdown of their diplomatic relations. Consequently, Ashurbanipal withdrew his support, leaving Lydia vulnerable to further Cimmerian attacks.213