Scholars have long had few sources but the Hebrew Bible to rely on for deciphering ancient Jewish history. With the rediscovery of Median Judaism and of Mandaeism being Crypto-Jewish as well do we however have substantially more sources to delve from. The customs, practices and sacred scriptures of Median Judaism and Mandaeism may offer many clues about pre-Israelite Jewish history in ancient Mesopotamia, ancient Egypt and ancient Canaan. This of course requires applying the diligent lens of the Great Tradition of the Art of Writing to ancient scripture. This is something that strangely has not been done with the Hebrew Bible, the older sections of which clearly are written through the Art of Writing and therefore logically also must be most carefully read through the lens of the Art of Writing. What is required therefore is transregional scholarship that integrates scripture, archaeology, custom and practice of a) the Southern Jurisdiction of Judah (Rabbinic Judaism and Karaite Judaism), b) the Northern Jurisdiction of Israel (Median Judaism worldwide) as well as c) Mandaeism.