Diodorus Siculus dīədôr´əs sĭk´yo͞oləs [key], d. after 21 BC, Sicilian historian. He wrote, in Greek, a world history in 40 books, ending with Caesar's Gallic Wars. Fully preserved are Books I–V and XI–XX, which cover Egyptian, Mesopotamian, Indian, Scythian, Arabian, and North African history and parts of Greek and Roman history. The history, which is a compilation of other sources, is often repetitive and contradictory. Historians generally regard it as uncritical and unreliable. It is valuable, however, as a source for the lost works of earlier authors, from whom he borrowed freely, and for his chronological lists of prominent figures from the 5th cent. to 302 BC
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