Ioannes Kegen

Kegen and his followers took refuge in Paristrion and appealed to Byzantine emperor Constantine IX Monomachos for help.

His appeal was warmly accepted, resulting in him being named patrician, converting to Christianity and his tribe getting recognized as foederati.

Kegen was to protect a sector of the empire from invasion, but continued to harass Tyrach.

Tyrach responded by a massive invasion of Byzantium, but, once defeated, was allowed to keep his army to aid in defending the empire against Seljuk incursions.

Kegen was sent by the emperor as an emissary to the Pechenegs, but was killed as a traitor.