Foederatus ( /ˌfɛdəˈreɪtəs/ in English; pl. foederati /ˌfɛdəˈreɪtaɪ/) is a Latin word whose definition and usage drifted in the time between the early Roman Republic and the end of the Western Roman Empire. Early in the history of the Roman Republic, a foederatus identified one of the tribes bound by treaty (foedus /ˈfiːdəs/), who were neither Roman colonies nor had they been granted Roman citizenship (civitas) but were expected to provide a contingent of fighting men when trouble arose, thus were allies. The Latini tribe were considered blood allies, but the rest were federates or socii.