Kievan Rus'
By the 11th century, Byzantine Jews of Constantinople had familial, cultural, and theological ties with the Jews of Kiev. For instance, some 11th-century Jews from Kievan Rus participated in an anti-Karaite assembly held in either Thessalonica or Constantinople. One of the three Kievan city gates in the times of Yaroslav the Wise were called Zhydovski.
Read more about this topic: History Of The Jews In Ukraine