A centurion (Latin: centurio; Greek: κεντυρίων), also hecatontarch in Greek sources (Greek: ἑκατόνταρχος or, in Byzantine times, κένταρχος) was a professional officer of the Roman army after the Marian reforms of 107 BC. Most centurions commanded a century (centuria) of 80 men, but senior centurions commanded cohorts, or took senior staff roles in their legion.
Centurions took their title from the fact that they commanded a century. Centuries were so-called because they originally numbered roughly 100 men. Just after that they numbered 60 men each and were paired into maniples, one with greater authority. After the Marian reforms, however, the standard establishment was set at 80 men.
Source: CIA Factbook, Wikipedia
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