This work presents a putative reconstruction, testing the hypothesis that Islam is historically linked to Jewish Christianity. The argument takes the Qur'anic text to be a valid start-point for historical inquiry and reconstructs from biased views of Jewish Christianity the notion of an enduring Nasorean movement. The effective link between the Nasorean movement and the Meccan religious awakening is the preaching of the Qur'anic Prophet Shu'ayb in Midian, on the border of Arabia.