Spinoza's ancestors were of Sephardic Jewish descent and were a part of the community of Portuguese Jews that had settled in the city of Amsterdam in the wake of the Portuguese Inquisition (1536), which had resulted in forced conversions and expulsions from the Iberian Peninsula. Attracted by the Decree of Toleration issued in 1579 by the Union of Utrecht, Portuguese converts to Catholicism first sailed to Amsterdam in 1593 and promptly reconverted to Judaism. In 1598, permission was granted to build a synagogue, and in 1615 an ordinance for the admission and government of the Jews was passed. As a community of exiles, the Portuguese Jews of Amsterdam were highly proud of their identity.