843 TREATY OF VERDUN (Carolinigian Empire)
Separated Germany from the Frankish (French) empire. Until this time the Frankish Empire also included Germany. As such, when the Carolingians were tolerant to their Jewish subjects it effected all the Jews in the kingdom. With the breakup of Carolingian empire the Kingdom became decentralized, and feudal lords and church leaders gained more power. This adversely affected the position of the Jews.