Deportations of Jews to foreign countries took place at various times. The most famous of those deportations was carried out by Nebuchadnezzar after his conquest of Judah, about 600 B. C. Many of Nebuchadnezzar's captives did not join in the return under the Persian monarchy, but remained permanently in the east and formed the nucleus of the large Jewish population of Mesopotamia. When Pompey conquered Palestine in the first century before Christ, he carried many Jews as slaves to Rome. Afterwards they were liberated, and formed a large Jewish colony at the capital of the empire. These are merely examples. Part of the dispersion was due to forcible exile.
Other causes have been mentioned in the Student's Text Book. It is a question, however, whether all of these causes combined are sufficient to account for the extraordinary growth of the dispersion. Schürer believes that the vastness of the Jewish population presupposes the merging of large bodies of proselytes into the Jewish people. He also believes, however, that these thoroughgoing conversions were less numerous in New Testament times than they had been before.
Harnack calculates that at the time of the death of Augustus there were from four million to four and a half million Jews in the Roman Empire, including about seven hundred thousand in Palestine, and that, if that estimate be correct, then the Jews formed perhaps some seven per cent of the total population. Of course, Harnack is himself the first to admit that such calculations are exceedingly uncertain. But so much at least is clear--the Jews in the first century were surprisingly numerous.
The name "Septuagint," derived from the Latin word for "seventy," has been applied to the Alexandrian translation of the Old Testament in reference to an ancient story about its origin. According to this story, the translation was made by seventy-two men summoned from Jerusalem by Ptolemy Philadelphus, king of Egypt, in order to add the Jewish law to the royal library at Alexandria. The story is certainly not true in details, and is probably not even correct in representing the translation as destined primarily for the royal library. More probably the translation was intended for the Greek-speaking Jews of Egypt.
The Septuagint is a translation of the Hebrew Old Testament into the Greek world language of the period, and into the popular, spoken form of that language, not into the literary form. The translation differs widely in character in the different books, for many different translators had a part in it. Some of the books are translated with such slavish literalness as to be almost unintelligible to a Greek. Everywhere, indeed, the influence of the Hebrew original makes itself felt to some degree. Hebrew idioms are often copied in the translation instead of being remolded according to the peculiarities of the Greek language.