ウェブBibliotheca historica. Diodorus Siculus or Diodorus of Sicily ( Greek: Διόδωρος, translit. Diódōros; fl. 1st century BC) was an ancient Greek historian. He is known for writing the monumental universal history Bibliotheca historica, in forty books, fifteen of which survive intact, [1] between 60 and 30 BC.