Quintus Fabius Pictor (flourished c. 200 BC; his birth has been estimated around 270 BC) was the earliest Roman historiographer and is considered the first of the annalists. He was a member of the Senate, and a member of the gens Fabia.
Fabius was the son of Consul Gaius Fabius Pictor (269 BC) and grandson of Gaius Fabius Pictor, "the Painter" (pictor in Latin). His career included fighting against the Gauls in 225 BC, and witnessing some if not all of the Second Punic War. He was appointed to travel to the oracle at Delphi in 216 BC, for advice after the Roman defeat at the Battle of Cannae.
Fabius wrote in Greek, but his work has not survived, and is known to us only through quotations and allusions in later authors. Although he is sometimes referred to as an annalist, it is not in fact clear whether his history was annalistic in form (i.e. narrated events year by year). Fabius used the records of his own and other important Roman families as sources, and began with the arrival of Aeneas in Latium. His work ended with his own recollections of the Second Punic War, which he blamed on Carthage, especially the Barca family of Hamilcar and Hannibal. He dated the founding of Rome to be in the "first year of the eighth Olympiad" or 747 BC, according to Dionysius of Halicarnassus.
Fabius drew on the writings of the Greek historians Diocles of Peparethus, who allegedly wrote an early history of Rome, and Timaeus, who had written about Rome in his history of the Western Greeks. In turn, Fabius was used as a source by Plutarch, Polybius, Livy, and Dionysius of Halicarnassus. By the time of Cicero his work had been translated into Latin.
Although Polybius used him as a source, he also accuses Fabius of being biased towards the Romans and inconsistent.