The decemviri or decemvirs (Latin for "ten men") were any of several 10-man commissions established by the Roman Republic.
The most important were those of the two Decemvirates, formally the "Decemvirs Writing the Laws with Consular Imperium" (Latin: Decemviri Legibus Scribundis Consulari Imperio) who reformed and codified Roman law during the Conflict of the Orders between ancient Rome's patrician aristocracy and plebeian commoners. Other decemviri include the "Decemviri Adjudging Litigation" (Decemviri Litibus Iudicandis), the "Decemviri Making Sacrifices" (Decemviri Sacris Faciundis), and the "Decemviri Distributing Public Lands" (Decemviri Agris Dandis Adsignandis).
The setting up of the Decemviri Legibus Scribundis Consulari Imperio occurred within the context of the two hundred-year Conflict of the Orders between the patrician order (the aristocracy) and the plebeian order (the commoners). The patricians had developed into the upper class by monopolising the priesthoods, which played an important part in the politics of archaic Rome and, in the Early Republic, the consulship (the office of the two annual elected heads of the Roman Republic and the army), and the seats of the (unelected) senate, the advisory body for the consuls. They were also large landowners. The form of labour exploitation during this archaic period was the nexum, which was what historians call debt bondage, bonded labour, or debt slavery. The debtor pledged his labour services as collateral for debt. Defaulting debtors were liable to have their labour bonded for life.