Diodorus Siculus (lived 1st century BC)

Greek historian. His Bibliotheca Historica consisted of 40 books in three sections: it covered the period from before the Trojan War to Julius Caesar's Gallic campaigns. Only books 1–5 and 11–20 have survived complete, the rest only in fragments and excerpts.

Diodorus Siculus was born at Agyrium, Sicily. He cobbled his work together by pillaging earlier writers. He was quite uncritical, and his value as a historical source is accordingly varied and unreliable, depending on the quality of the source he was following at the time.