Western Asia Minor was important already in Antiquity. There were numerous settlements with an enormous cultural potential and considerable economic power. In the Middle Ages, western Asia Minor was one of the central areas of the Byzantine Empire. In the early Byzantine period, the provinces Asia (ca. 19.100 km2) and Lydia (ca. 16.000 km2) were located there. Both provinces will be studied, following the established methods of historical geography of the Tabula Imperii Byzantini, by interpreting written sources, toponyms, the archaeological evidence, and the physical state of the landscape. Due to the wealth of evidence, the results will be published in several volumes.

The Byzantine Province Lydia with its important market centers Thyatira (Akhisar), Sardis (Sart) and Philadelphia (Alasehir) and its main rivers Hermus (Gediz cay) and Cogamus (Alasehir cay) was adjacent to Hellespont in the North (TIB 13 “Bythynien und Hellespont"), to Phrygia in the East (TIB 7) and to Asia in the South and in the West (TIB 17).