Egyptian Origins of the Chaldaeans

Diodorus Siculus, The Library of History, 1st century B.C.

Now the Egyptians say that also after these events a great number of colonies were spread from Egypt over all the inhabited world. To Babylon, for instance, colonists were led by Belus, who was held to be the son of Poseidon and Libya; and after establishing himself on the Euphrates river he appointed priests, called Chaldaeans by the Babylonians, who were exempt from taxation and free from every kind of service to the state, as are the priests of Egypt; and they also make observations of the stars, following the example of the Egyptian priests, physicists, and astrologers. They say also that those who set forth with Danaus, likewise from Egypt, settled what is practically the oldest city in Greece, Argos, and that the nation of the Colchi in Pontus and that of the Jews, which lies between Arabia and Syria, were founded as colonies by certain emigrants from their country; and this is the reason why it is a long-established institution among these two peoples to circumcise their male children, the custom having been brought over from Egypt. Even the Athenians, they say, are colonists from Saïs in Egypt, and they undertake to offer proofs of such a relationship ....

... to us it seems not inappropriate to speak briefly of the Chaldaeans of Babylon and of their antiquity, that we may omit nothing which is worthy of record. Now the Chaldaeans, belonging as they do to the most ancient inhabitants of Babylonia, have about the same position among the divisions of the state as that occupied by the priests of Egypt; for being assigned to the service of the gods they spend their entire life in study, their greatest renown being in the field of astrology.