In Islamic and Jewish tradition, Arabs are a Semitic people who trace their ancestry from Ishmael, a son of the ancient patriarch Abraham and Hagar. Medieval Arab genealogists separate the Arabs into two groups: the "original Arabs" of South Arabia, descending from Qahtan (identified with the biblical Joktan) and the "Arabized Arabs" (musta`ribah) of North Arabia, descending from Adnan who is descended from Ishmael.