The Kingdom or Domain of Soissons was a rump state of the Western Roman Empire in northern Gaul, between the Somme and the Seine, that lasted for some 25 years during Late Antiquity. The rulers of the rump state, notably its final ruler Syagrius, were referred to as "Kings of the Romans" (Latin: "rex Romanorum") by the Germanic peoples surrounding Soissons, with the polity itself being identified as the "Regnum Romanorum", "Kingdom of the Romans", by the Gallo-Roman historian Gregory of Tours. Whether this title was used by Syagrius himself or was applied to him by the barbarians surrounding his realm in a similar way to how they referred to their own leaders as kings is unknown. "Kingdom (or Domain) of Soissons" is a later, historiographical term for the state.