A native of Barzrberd, he was said to have come to office not by nobility or riches but by his piety. He officiated at the forced wedding of Queen Zabel to Hetoum I which made them joint Armenian Cilician King and Queen. In 1259 Constantine visited the Mongol warload Hulegu who had conquered Mesopotamia and blessed him. This was part of an alliance between Cilician Armenia and the expanding Mongol Empire. Hulegu is said to have been sympathetic to Christians, having been the son of one, and did not harm them during his campaigns.