Archaeologica.org

In Spain and Portugal, the plague crept inland from the port cities at a somewhat slower pace than in Italy and France. In the war at Granada, the Muslim soldiers were the first to succumb to the illness, and so horrific did they find it that some feared it was Allah's punishment and even contemplated converting to Christianity. Before any could take so drastic a step, however, their Christian enemies were also struck down by the hundreds, making it plain that the plague took no notice of religious affiliation.

It was in Spain that the only ruling monarch to die of the disease met his end. The advisors of King Alfonse XI of Castile begged him to isolate himself, but he refused to leave his troops. He fell ill and died on March 26, 1350: Good Friday.