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The history of the Jews in Turkey covers the 2400 years that Jews have lived in what is now Turkey. There have been Jewish communities in Anatolia since at least the beginning of the common era. Anatolia's Jewish population before Ottoman times primarily consisted of Greek-speaking Romaniote Jews, with a handful of dispersed Karaite communities. In the late fifteenth and early sixteenth centuries, many Sephardic Jews from Spain, Portugal and South Italy expelled by the Alhambra Decree found refuge across the Ottoman Empire, including in regions now part of Turkey. This influx played a pivotal role in shaping the predominant identity of Ottoman Jews. By the end of the sixteenth century, the Jewish population in the Ottoman Empire was double (150,000) that of Jews in Poland and Ukraine combined (75,000), far surpassing other Jewish communities to be the largest in the world. Turkey's Jewish community was large, diverse and vibrant, forming the core of Ottoman Jewry until World War I. Early signs of change included education reforms and the rise of Zionism. The community declined sharply after World War I, with many emigrating to Israel, France and the Americas. Turkish Jews in Israel became leaders of the Sephardic community, and their Ladino language was a prominent characteristic. Today, the vast majority of Turkish Jews live in Israel, though Turkey itself still has a modest Jewish population, where the vast majority live in Istanbul, and the remainder in İzmir. Jews are one of the four ethnic minorities officially recognized in Turkey, together with Armenians, Greeks, and Bulgarians.