Ottoman Empire
Ottoman government deliberately pursued a policy for the development of Bursa, Edirne, and Istanbul, successive Ottoman capitals, into major commercial and industrial centres, considering that merchants and artisans were indispensable in creating a new metropolis. To this end, Mehmed and his successor Bayezid, also encouraged and welcomed migration of the Jews from different parts of Europe, who were settled in Istanbul and other port cities like Salonica. In many places in Europe, Jews were suffering persecution at the hands of their Christian counterparts, such as in Spain after the conclusion of Reconquista. The tolerance displayed by the Turks was welcomed by the immigrants.

Q: Persecution of Jews in Spain occurred after what event concluded?
the conclusion of Reconquista