The ancient author Euhemerus wrote a book called the Sacred History late in his life (d. c. 220 BCE). The ancient Greek was translated by Ennius into Latin. What he wrote has come down to us in scant reference in Ennius, Diodorus Siculus and a few others. However, a few fragments of Latin texts do survive, and these are the scraps which have won the lottery against water, sun, wind, fire, bacteria and fungus -- and survive to this day in dark drawers in (mostly German and Dutch) museums.

Two things about these must be remembered. The fragments themselves are piecemeal, even less pieces of the jigsaw puzzle than the Dead Sea fragments, as there are fewer.

Also, these are unlikely fragments from Ennius' own hand, and may be anywhere from original to him to several copies from the original, and as each copy and each generation of copy (think Bible) separate from the original, the text becomes less reliable.