A centurion (/sɛnˈtjʊəriən/; Latin: centurio; Greek: κεντυρίων, kentyríōn or ἑκατόνταρχος, hekatóntarkhos) was a professional officer of the Roman army after the Marian reforms of 107 BC. Centurions originally commanded a hundred men (a century) of around 80 legionaries, with the other 20 being servants and orderlies, but senior centurions commanded cohorts or took senior staff roles in their legion. Centurions were also found in the Roman navy. In the Byzantine Army, they were also known by the name kentarch (κένταρχος, kentarchos). Their symbol of office was the vine staff, with which they disciplined even Roman citizens protected from other forms of beating by the Porcian Laws.