1) Military rank of Greece 
Pentakosiarch (πεντακοσιάρχης, pentakosiarches in Modern Greek usually πεντακοσίαρχος, pentakosiarchos), meaning `commander of 500`, is a Greek military rank, first adopted in the infantry of the Army of Macedon (cf. Aelianus Tacticus and Plutarch, Life of Alexander, 76). The pentakosiarch commanded a pentakosiarchy (.....