Manglisi is one of the oldest Christian sites in Eastern Georgia. The first church was built at the location in the fourth century, soon after the Kingdom of Iberia had officially adopted Christianity as the state religion in around 330. In the 490s, a new church was constructed in Manglisi. By that time, it was commonly believed that relics which had borne witness to Christ were kept at Manglisi. Their possession made Manglisi the Caucasian-wide center for pilgrimage.