The reference here is to the famous monastery of St. John the Baptist, which was built by Gregory the Illuminator during the fourth century, on the mountain of Kark, near the Euphrates, on a spot where heathen altars had previously stood. On certain days pious Armenians made annual pilgrimages to the place. Among them many poets and champions, who, with long fasts and many prayers, begged from the saint the gifts of song, strength, and courage. John the Baptist was regarded by the Armenians generally as the protector of the arts.
So the Armenians called Christians.
The original name of this city is Theodosiopol. It was founded by the Greek commander Anato in the year 412 A.D. and named in honor of Emperor Theodosius II. Later it was captured by the Sultan of Ikonika, Who named it Arsi-Rom, "Land of the Greeks." The Armenians call it Karin, after the old Armenian province in which it lies.