DIEHL Charles, “Histoire de l’ Empire Byzantin”, Paris, Auguste Picard, 1919. 8vo, pp.xi, 239. EX libris, 15 full page photographic plates, 2 double page and 2 folding maps. Charles Diehl was a famous French historian specializing in Byzantine history as well as an author of several influential books. He is widely known for restoring the church of Hagia Sophia in Thessaloniki.