PS: In reference to some earlier discussion in this thread. In the article The “Mother of Israel” or the “Sephardi Metropolis”? Sephardim, Ashkenazim, and Romaniotes in Salonica
(Jewish Social Studies: History, Culture, Society vol. 22, no. 1 (Fall 2016): 81–129. Copyright © 2016 The Trustees of Indiana University. doi:10.2979/jewisocistud.22.1.03)
authored by Devin E. Naar, Isaac Alhadeff Professor of Sephardic Stud-ies, associate professor of history and Jewish Studies, and chair of the Sephardic Studies Program at the University of Washington. He is the author of Jewish Salonica: Between the Ottoman Empire and Modern Greece (2016). (denaar@uw.edu),
Professor Naar repeats the list of synagogues founded in Salonika:
"Known as the “historic congregations,” the 29 initial kehalim established in Salonica through the seventeenth century demonstrate the diverse backgrounds of the city’s Jews. The names of the kehalim referred to the places from which their founders came. The plurality—13—were founded by Jews who arrived not directly from Spain but from Italy (named Italia, Sisilia, Pulia, Otranto); seven by Jews from Spain (Sefarad, Kastiya, Mayorca, Cataluña, Aragon); five from Portugal (Portugal, Lisbon, Evora); and one from North Africa (Mograbis). They joined Greek (Etz Ahaïm, established in the first century), central European (Ashkenaz, 1376), French (Provencia, 1394), and Venetian (1423) congregations that had been established, according to local tradition, prior to 1492." p 86
In the footnote following this passage, Professor Naar cites the following reference for this information:
Elias Messinas, The Synagogues of Salonika and Veroia (Athens, 1997)
So it seems that the establishment in 1376 of an Ashkenazic Synagogue in Salonika, cited in Wikipedia, is supported by several scholars.
Further on in the same article Naar states:
"Ashkenazi Jews had deep roots in Salonica, with their first synagogue established, according to local tradition, in 1376 by Jews from Hungary and expanded by Jews from Germany in 1470." p. 103
My guess is that the Buda Jews who built the Salonika temple were not that far removed from the Holy Roman Empire themselves, likely having fled from there about 100 years earlier. This remains to be verified....