"The first Graeco-Egyptian astrologists did not invent the discipline they claimed to teach the Hellenic world. They used Egyptian sources going up to the Persian period which were themselves at least partially derived from ancient Chaldaean documents. Traces of this primitive substratum still survive in our much later texts, erratic blocks transported on to more recent soil. When we find mentions there of ‘the king of kings’ or ‘satraps’ we are no longer in Egypt but in the ancient Orient … We limit ourselves to noting that in all appearances, the priests who were the authors of Egyptian astrology stayed relatively faithful to the ancient Oriental tradition."