sentences:  Constantine Gabras
  
  Constantine Gabras or Gavras () 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.Gabras ruled Chaldia as a semi-independent prince between 1126 and 1140.