(From the Jewish History Channel)

(The following is a brief synopsis of a subject that is dealt with in much more detail in my upcoming paper).

However, there were authentic Sephardic congregations in Eastern Europe. Dr. Moshe Montalto, a Sephardic Physician who settled in Poland in the 17th century built a Synagogue in Lublin where the congregants prayed in the Sephardic (Spanish-Portuguese) rite. In Zamocz too, a Synagogue (pictured first from top) was established by Sephardic Jews who settled there in the 16th century and was still called the "Sephardic Synagogue" up until World War II, long after the descendants of the original Sephardic founder assimilated into the Ashkenazi community or moved out.

In Krakow, the historic capital of Poland, a community of Sephardic Jews, who arrived in Poland via Italy, maintained a separate existence until the middle of the 17th century. They kept their own traditions, including praying in the Sephardic rite and only marrying among themselves.

In Lithuania too, authentic Sephardic congregations existed. Shlomo Katzav in his booklet Hasefardim be'eretz Lita lists Sephardic congregations in places like Otian, Biraz, Dolhinov, Heidozishok, Vilkomir and Kopishok. Katzav lists several congregations with the name "Alsheikh" (in Horodna and Shavel, which probably indicate eastern origins). There are also two "Alfas" (indicating origins in Fez, Morocco) congregations, one in Tabarig and one in Lida.

Arthur Menton in The Book of Destiny: Toledot Charlap mentions one Lithuanian town whose Jewish community seems to have been founded by Sephardic emigres, namely Vilkaviskis (Vilkovishk). The community kept accurate records and as recently as 1920, a massive tome containing information about 400 years of Jewish life in Vilkaviskis was cited by several researchers. The book was unofrtunately lost or destroyed in the decades after World War I.
The book indicated that a Jewish settlement existed here at the beginning of the 16th century...Princess Bora Sforges made a gift of lumber to the community to build prayer houses and the copper domed synagogue known to its last days as "the old shul". Its ark... housed the profusely embellished Sefer Torahs which originated in Spain.
Menton's book also recounts the fascinating story of the Charlap/Don-Yahya family; a Sephardic family that settled in Eastern Europe.

In Budapest, Hungary there once existed both a Sephardic and Mizrachi synagogue (the former composed of Spanish and Portuguese Jewish refugees and the latter composed of Syrian Jews who settled in the city). As their numbers decreased, gradually their seperate minyan folded up everywhere and those who remained joined the Ashkenazi minyan (a process that was repeated all across Eastern Europe). [5]