There exists an ancient account of the origin of this nation to the following effect. Armenus of Armenium, a Thessalian city, which lies between Pheræ and Larisa on the lake Bœbe, accompanied Jason, as we have already said, in his expedition into Armenia, and from Armenus the country had its name, according to Cyrsilus the Pharsalian and Medius the Larisæan, persons who had accompanied the army of Alexander. Some of the followers of Armenus settled in Acilisene, which was formerly subject to the Sopheni; others in the Syspiritis, and spread as far as Calachene and Adiabene, beyond the borders of Armenia.
The dress of the Armenian people is said to be of Thessalian origin; such are the long tunics, which in tragedies are called Thessalian; they are fastened about the body with a girdle, and with a clasp on the shoulder. The tragedians, for they required some additional decoration of this kind, imitate the Thessalians in their attire. The Thessalians in particular, from wearing a long dress, (probably because they inhabit the most northerly and the coldest country in all Greece,) afforded the most appropriate subject of imitation to actors for their theatrical representations. The passion for riding and the care of horses characterize the Thessalians, and are common to Armenians and Medes.
The Jasonia are evidence of the expedition of Jason: some of these memorials the sovereigns of the country restored, as Parmenio restored the temple of Jason at Abdera.