Öz The sources and literature on the medial history of Diyarbekr region are limited as it is the general case with the medieval history of Anatolia on the whole. Apart from few sources which are, however, directly related to the area there are othere sources from which indirect infirmation can be derived to study the history of the area. Inorder to avoid confusion, however, no such classification will be made, rather they will be treated under original or primary sources, secondary literature and Armenian and Syriac sources. Before examining them, nevetheless, it would perhaps be better to briefly mention few works and bibliographies in which there can be found a good literature on the area.