The city of Medina, some 280 miles north of Mecca, had originally been settled by Jewish tribes from the north, especially the Banu Nadir and Banu Quraiza. The comparative richness of the town attracted an infiltration of pagan Arabs who came at first as clients of the Jews and ultimately succeeded in dominating them. Medina, or, as it was known before Islam, Yathrib, had no form of stable government at all. The town was tom by the feuds of the rival Arab tribes of Aus and Khazraj, with the Jews maintaining an uneasy balance of power. The latter, engaged mainly in agriculture and handicrafts, were economically and culturally superior to the Arabs, and were consequently disliked…. as soon as the Arabs had attained unity through the agency of Muhammad they attacked and ultimately eliminated the Jews.
— Arabs in History, p. 40. Bernard Lewis