Caliph Omar II, banned Jewish worship on the Temple Mount. Jews were forced to pray outside the walls of the mount or in a covered staircase called "ha-Meara" the Cave, which was near an ancient gate, known today as Warrens gate. The prohibition regarding Jewish worship on the Mount remains in effect today.
720 SERENE (aka Serenus) (Babylon)
A recent convert was discovered to having seduced a local Jewish girl. Offended by the reaction, he decided to take revenge by pretending to be the messiah. He requested that people give him their wealth so that he could prepare a march to the holy land. He also urged that the Talmud be abolished. Caliph Yezid, Omar's successor, arrested this "Messiah" and handed him over to the Jews in Pumbedita for punishment. Natronai ben Nehemia (Gaon) urged the Jewish community to readmit their brethren into the fold. They eventually did so, though they were initially reluctant.
726 LEO III (the Isaurian) ( Byzantine Empire)
Published his new codes of law called the Ecloga (Selection). Although Judaism was to be restricted, it was not banned.