According to the Rabatak inscription, Kujula Kadphises was a Kushan ruler and the grandfather of the great Kushan king Kanishka I.

It seems that Kujula's empire was invaded by the Indo-Parthian ruler Gondophares and that much of his territory had to be abandoned.

Kujula's coins were Hellenic in inspiration. They were modeled after the coins of the Indo-Greek king Hermaeus. Many of them have representations of the Greek god Heracles on the back.