Alhambra Decree
The Alhambra Decree (also known as the Edict of Expulsion) was an edict issued on 31 March 1492, by the joint Catholic Monarchs of Spain (Isabella I of Castile and Ferdinand II of Aragon) ordering the expulsion of Jews from the Kingdoms of Castile and Aragon and its territories and possessions by 31 July, of that year.
The edict was formally revoked on 16 December 1968, following the Second Vatican Council.
In 2014, the government of Spain passed a law allowing dual citizenship to Jewish descendants who apply, in order to "compensate for shameful events in the country’s past." Thus, Sephardic Jews who are descendants of those Jews expelled from Spain due to the Alhambra Decree, and can prove it, can "become Spaniards without leaving home or giving up their present nationality."
Background
Beginning in the 8th century, Muslims had conquered and settled most of the Iberian Peninsula. Jews, who had lived in these regions since Roman times, were considered "People of the Book" and given special status and often thrived. The tolerance of the Muslim Moorish rulers of al-Andalus attracted Jewish immigration, and Jewish enclaves in Muslim Iberian cities flourished as places of learning and commerce. Progressively, however, living conditions for Jews in al-Andalus became harsher, especially after the fall of the Umayyad Caliphate.