The Catalans and Aragonese

The Catalans and Aragonese offered themselves to the Byzantine Emperor Andronicus II Palaeologus to fight the Turks. Having conquered these, they turned their arms against the Byzantines, who treacherously slew their leaders; but for this treachery, the Spaniards, under Bernard of Rocafort and Berenguer of Entenca, exacted the terrible penalty celebrated in history as “The Catalan Vengeance” and seized the Frankish Duchy of Athens (1311).[24] The royal line of Aragon became extinct with Martin the Humane, and the Compromise of Caspe gave the Crown to the House of Trastámara, already reigning in Castile.

As in the rest of Europe during the Late Middle Ages, Antisemitism greatly increased during the 14th century in the Christian kingdoms (a key event in that regard was the Black Death, as Jews were accused of poisoning the waters).[53] There were mass killings in Aragon in the mid-14th century, and 12,000 Jews were killed in Toledo. In 1391, Christian mobs went from town to town throughout Castile and Aragon, killing an estimated 50,000 Jews.[54][55][56][57][58][59] Women and children were sold as slaves to Muslims, and many synagogues were converted into churches. According to Hasdai Crescas, about 70 Jewish communities were destroyed.[60] St. Vincent Ferrer converted innumerable Jews, among them the Rabbi Josuah Halorqui, who took the name of Jerónimo de Santa Fe and in his town converted many of his former coreligionists in the famous Disputation of Tortosa (1413–14).