Abstract: (Fluid identities, slippery diversities in the Banat of the 4th century AD) This approach takes into account the ethno-cultural dimension of the concepts of community identity / diversity. The proposed case study the ethno-demographic state of affairs in the plain area east of the lower Tisza (Banat plain), in the period immediately following the so-called Aurelian retreat. We point out that, relative to these spatio-temporal coordinates, the current interpretations of the subsumable archaeological discoveries do not converge with the data provided by the main related literary sources.