Abstract This paper refers to habitation in the Byzantine Empire from the 7th to the 11th centuries and attempts a reappraisal of the patterns used to describe, evaluate and interpret the distribution of archaeological remains. Based on the study of a region in western Greek mainland, several contradictions between the historical and the archaeological evidence on settlement are being discussed; those reveal the prevalence of dispersed rather than nuclear patterns of habitation in the area. These patterns are further discussed within the context of medieval settlement around the Mediterranean. The physical form of Middle Byzantine Episcopal sees is sought for while the term ‘κάστρον’ is examined against the “archaeological imaginary” of 6th–11th c. Byzantine fortified settlements. It is concluded that the contextualization of archaeological and historical evidence for Middle Byzantine settlements in Southern Epiros demonstrates instead a rather flexible organization of habitation; episcopal sees do not seem to have corresponded to any clear distinct type of settlement. It is therefore suggested that during periods of rapid social change expressed through a transformation of habitation, specific forms or sizes of settlements cannot be correlated to specific functions or other political or socioeconomic activities. There should rather be more of “hybrid” settlement formations of changing nature and mixed qualities. Given the dynamic development pattern of Byzantine habitats, there is room for such “open” analytical categories in the archaeology of settlements, in order to facilitate descriptions of find distributions which do not conform to the available theoretical patterns. These new categories could further lead to an emergence of new interpretation schemes bringing out the spatial differentiation and uniqueness which seems to have been very much the case in the evolution of Byzantine provincial settlement patterns.