A centurion (/sɛnˈtjʊəriən/; Latin: centurio, pl. centuriones; Greek: κεντυρίων, translit. kentyríōn, or Greek: ἑκατόνταρχος, translit. hekatóntarkhos) was a position in the Roman army during Classical Antiquity, nominally the commander of a century (Latin: centuria), a military unit of around 80 legionaries. In a Roman legion, centuries were grouped into cohorts commanded by their senior-most centurion. The prestigious 1st cohort was led by the primus pilus, the most senior centurion in the legion and its third-in-command.