Constantine Gabras or Gavras (Greek: Κωνσταντίνος Γαβρᾶς) was the governor or doux (duke) of the Byzantine province of Chaldia, centred on the Black Sea port of Trebizond and its mountainous hinterland, the Pontic Alps, in northeast Anatolia, now part of Turkey.
The province of Chaldia effectively became an autonomous semi-hereditary domain of the Gabrades as his father, Theodore Gabras, preceded him as governor.
[1] After service as strategos of Philadelphia,[2] Constantine became doux of Chaldia some time, probably quite shortly, before the death of Alexios I in 1118.
[4] In 1140, Emperor John II Komnenos (r. 1118–1143) moved into Chaldia with the main Byzantine army in order to campaign against the Danishmend Turks.
[5] Following their loss of power, the family of the Gabras had three options: to save their lands south of the Pontic Alps and their influence by joining the court of the Seljuk Sultanate of Rum at Konya; to save some of their influence within the Byzantine sphere by joining their new masters at Constantinople; or to move to the Byzantine province most closely connected to their former lands and, from c. 1200, free of control from Constantinople -- the Perateia in the Crimea.