830 BENJAMIN BEN MOSHE NEHAWENDI (Persia)
Was considered the real successor to Anan ben David, the founder of the Karaite sect, although he lacked the charisma of his predecessor. He formulated free biblical study and interpretation, and tried to base Karaite law on the Bible. He also sought a less belligerent attitude towards rabbinical authorities and is credited in being the first to use the name Karaites or Bnai Mikra.
834 ALEPPO (Syria)
The Great Synagogue was built. Parts of it, including the original inscriptions, still exist.
838 AMORIUM (Central Byzantine Empire)
Just before its capture by the Arabs, fighting broke out between Jews and Christians. Included in the fights was a Judaizing sect which kept Biblical Law (except circumcision) and had both men and women serving as spiritual leaders. Rumors were spread that the Emperor Michael II (820-829) came from this sect.
839 BODO (Alemah, Carolingian Empire)
A nobleman converted to Judaism, married a Jewess and moved to Sarargossa, Spain. There he tried to influence his family to convert as well. This strengthened the arguments of Archbishop Agobard and others who were trying to convince King Louis the Pious to return to former medieval anti-Jewish policies.