Lactantius

“ Above all things, he who desires to comprehend the truth ought not only to apply his mind to understand the utterances of the prophets, but also most diligently to inquire into the times during which each one of them existed, that he may know what future events they predicted, and after how many years their predictions were fulfilled. ”

“ And many have written and published books respecting the times, making their commencement from the prophet Moses, who lived about seven hundred years before the Trojan war. But he, when he had governed the people for forty years, was succeeded by Joshua, who held the chief place twenty-seven years. ”