Lochagos (; abbreviated Λγος) is used in the Greek language to mean "Captain". More precisely, it means "leader of a lochos". The equivalent term in the Hellenic Army Armour & Cavalry is .
The rank of lochagos could also represent an officer roughly equivalent to that a Roman army centurion. The term was however also used by later writers to describe the civilian leader of a curia. The rank was still in use in the Byzantine army of the Byzantine Empire, although more usually, the term hecatontarch was used, a calque of the Latin centurio. Certain early Byzantine units such as the infantry auxilia and the cavalry Scholae lacked centurions and decurions, but had centenarii and decenarii instead. These are mentioned both in the Strategikon of Maurice and by Jerome. Warren Treadgold interprets these to be a type of junior and senior centurion, a designation based on seniority and experience, not a distinction in rank.
===Rank insignia===
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