Priests claiming descent from Aaron controlled the high priesthood of temples in Jerusalem and on Mount Gerizim in the Second Temple period. These Aaronides were in a position to influence religious developments in this period, especially the scripturalization of the Torah. The priests’ dynastic claims were probably a significant factor in the elevation of the Pentateuch to scriptural status. This claim can be tested by correlating what little we know about the Aaronide dynasties with what little we know about the scripturalization of two different portions of the Hebrew Bible, the Pentateuch and Ezra-Nehemiah.