Mizrahi Jews the unique rite of the Yemenite Jews, and lately, Beta Israel religious leaders in Israel have also joined Sefardi rite collectivities, especially following rejection of their Jewishness by some Ashkenazi circles. The reason for this classification of all Mizrahim under Sephardi rite is that most Mizrahi communities use much the same religious rituals as Sephardim proper due to historical reasons. The prevalence of the Sephardi rite among Mizrahim is partially a result of Sephardim proper joining some of Mizrahi communities following the 1492 Alhambra Decree, which expelled Jews from Sepharad (Spain and Portugal). Over the last few centuries, the previously
Ashkenazi Hebrew from Spain in 1492 (or before) the Sephardic pronunciation of the vowels became standard in all these countries, ironing out any differences that previously existed. This makes it harder to adjudicate between the different theories on the relationship between today's pronunciation systems and those of ancient times. Leopold Zunz believed that the Ashkenazi pronunciation was derived from that of Palestine in Geonic times (7th–11th centuries CE), while the Sephardi pronunciation was derived from that of Babylonia. This theory was supported by the fact that, in some respects, Ashkenazi Hebrew resembles the western dialect of Syriac while Sephardi Hebrew resembles the