It was the Arabs who allowed the Jews back into Jerusalem from where the Byzantines had mostly excluded them.Jerusalem prior to the Ottomans was Arab dominated for much of the period. Since the time of the Arab conquest in the 7th C.up until the 9th and 10th centuries by which time in Jerusalem the majority of Jerusalemites were actually 'Karaites' who [unhindered by rabbinical prohibitions from returning to the city before the messiah returned] had been drawn to the city during this period. Karaites considered themselves Jewish but were deemed heretics by rabbinical authorities. These Jews were presumably massacred in the Christian crusade to come along with the Muslim inhabitants. It is quite complex and the mixing of peoples [many Jews converting to Islam over an extended period] also further confuses the situation. Only in the 19thC did the ultra orthodox Jews once again constitute a majority in the city. Many of these Jews however are quite likely descendants of late converts, ultra orthodox Jews emanating originally from Khazaria. See Professor of History at Tel Aviv University, Shlomo Sand's; 'Invention of the Jewish People'.
In three days, Greek coastguard rescues 2,500 migrants (Reuters)
from the article: Livni to Sweden: Ditch EU plan on dividing Jerusalem