of southern Crimea (1315–1475) saw rising degrees of Jewish settlement in the region. The Jewish community was divided among those who prayed according to the Sephardi, Ashkenazi and Romaniote rites. In 1515 the different traditions were united into a distinctive Krymchak prayer book, which represented the Romaniote rite by Rabbi Moshe Ha-Golah, a Chief Rabbi of Kiev, who had settled in Crimea. In the 18th century the community was headed by David Ben Eliezer Lehno (d. 1735), author of the introduction to the "Kaffa" rite prayer book and Mishkan David ("Abode of David"), devoted to Hebrew grammar. He was also the author of a monumental Hebrew historical chronicle, Devar sefataim ("Utterance the mouth"), on the history of the Crimean Khanate. Tatar rule Under the Crimean Khanate the Jews lived in separate quarters and paid the dhimmi-tax (the Jizya). A limited judicial autonomy was granted according to the Ottoman millet system. Overt, violent persecution was extremely rare. According to anthropologist S.Vaysenberg, "The origin of Krymchaks is lost in the darkness of the ages. Only one thing can be said, that they carry less Turkic blood than the Karaites, although certain kinship between both peoples and the Khazars can hardly be denied. But Krymchaks during the Middle Ages and modern times constantly mixed with their European counterparts. There was an admixture with Italian Jews from the time of the Genoeses with the arrival of the Lombroso, Pyastro and other families. Cases of intermarriage with Russian Jews occurred in recent times. There is no general work on the ethnography of Krymchaks. The available summary of folklore materials is not complete. Extensive anthroponimic data has been collected from the late 19th and early 20th centuries, but does not cover earlier periods, for which archival material does exist. The study of each of these groups of sources can shed light on the ethnogenesis of the Krymchak ethnic minority. Russian and Soviet rule The Russian Empire annexed Crimea in 1783. The Krymchaks were thereafter subjected to the same religious persecution imposed on other Jews in Russia. Unlike their Karaite neighbors, the Krymchaks suffered the full brunt of anti-Jewish restrictions. During the 19th century many Ashkenazim from Ukraine and Lithuania began to settle in Crimea. Compared with these Ashkenazim the Krymchaks seemed somewhat backward; their illiteracy rates, for example, were quite high, and they held fast to many superstitions. Intermarriage with the Ashkenazim reduced the numbers of