Lazica was a border state of the Byzantine Empire and the Sassanid Empire; it was Christian, but in the Sassanid sphere. It's king, Tzath, wished to reduce Sassanid influence. In 521 or 522, he went to Constantinople to receive the insignia and royal robes of kingship from Justin's hand and to make his submission. He was also baptized as a Christian and married a Byzantine noblewoman, Valeriana. After having been confirmed in his kingdom by the Byzantine emperor, he returned to Lazica. Shortly after Justin's death the Sassanids attempted to forcibly regain control, but were beaten off with assistance from Justin's successor.