March 31st: Possibly the Darkest Date in Jewish History

By Ashley Perry

However, on the 31st March 1492 the Alhambra Decree, the Edict of Expulsion from Spain, was signed by the joint Catholic Monarchs of Spain (Isabella I of Castile and Ferdinand II of Aragon) ordering the expulsion of practicing Jews from the Kingdoms of Castile and Aragon and its territories and possessions by 31 July, of that year.

https://blogs.timesofisrael.com/march-31st-possibly-the-darkest-date-in-jewish-history/