Constantine I or Kostandin I (; 1035âÂÂ1040 â 1100) was the second lord of Armenian Cilicia from 1095 to until about 1099.
He was the son of Roupen I. Constantine began leading the troops during 1090. The mastery of this mountain defile made possible the assessment of taxes on merchandise transported from the port of Ayas towards the central part of Asia Minor, a source of wealth to which the Roupenians owed their power.
After his father's death in 1095, the crusaders, for their part, duly appreciated the aid of their Armenian allies.
The Chronographie of Samuel of Ani records that Constantine died soon after a lightning bolt struck his table in the fortress of Vahka. He was buried in Castalon.
According to the Chronicle of Aleppo, his wife was descended from Bardas Phokas.