At the
Battle of the Granicus in 334 BC he led the
Thessalian cavalry in
Alexander's army, and was appointed by him in the same year to the
satrapy of the Lesser or
Hellespontine Phrygia, to which
Paphlagonia was soon after added. Excluding a failed attempt to conquer
Bithynia, we do not hear of Calas: it would seem, however, that he died before the treason and flight of his father in 325, as we know from
Arrian that
Demarchus succeeded him in the satrapy of the
Hellespontine Phrygia during Alexander's life-time. ==References==