Khor Virap and the monastery of Khor Virap is located in Ayrarat state of in the province of Greater Armenia's Ayrarat province, in the state of Vostan, on the left side of Araks river. According o Agatangeghos, during the persecutions of Christians, Tiridat the 3rd put into jail, where Saint Gregory the Illuminator spent 14 years. After being set free and having the king's support, Christianity became the state religion. The monastery of Khgor Virap was foundedin 5th century.