Diodoro Siculo (Diodorus Siculus)

According to his own work, he was born in Agyrium in Sicily (now called Agira). With one exception, antiquity affords no further information about his life and doings beyond his written works. Only Jerome, in his Chronicon under the "year of Abraham 1968" (49 BC), writes, "Diodorus of Sicily, a writer of Greek history, became illustrious". However, his English translator, Charles Henry Oldfather, remarks on the "striking coincidence" that one of only two known Greek inscriptions from Agyrium (Inscriptiones Graecae XIV, 588) is the tombstone of one "Diodorus, the son of Apollonius" ("Διόδωρος ∙ Ἀπολλωνίου"). The final work attributed to him is from 21 BC.

Diodorus's universal history, which he named Bibliotheca historica (Ancient Greek: Βιβλιοθήκη Ἱστορική, "Historical Library"), was immense and consisted of 40 books, of which 1–5 and 11–20 survive: fragments of the lost books are preserved in Photius and the Excerpts of Constantine Porphyrogenitus.
It was divided into three sections. The first section (books I–VI) deals with the mythic history of the non-Hellenic and Hellenic tribes up to the destruction of Troy and is geographical in theme, describing the history and culture of Ancient Egypt (book I), of Mesopotamia, India, Scythia, and Arabia (II), of North Africa (III), and of Greece and Europe (IV–VI).
The next section (books VII–XVII) recounts the history of the world from the Trojan War down to the death of Alexander the Great. The last section (books XVII to the end) concerns the historical events from the successors of Alexander down to either 60 BC or the beginning of Julius Caesar's Gallic Wars. The end has been lost, so it is unclear whether Diodorus reached the beginning of the Gallic War as he promises at the beginning of his work or, as evidence suggests, old and tired from his labours, he stopped short at 60 BC.
Diodorus selected the name "Bibliotheca" in acknowledgment that he was assembling a composite work from many sources. Identified authors on whose works he drew include Hecataeus of Abdera, Ctesias of Cnidus, Ephorus, Theopompus, Hieronymus of Cardia, Duris of Samos, Diyllus, Philistus, Timaeus, Polybius, and Posidonius.