The consequences of anti-Semitism

Until today, the only major historical event that I knew of in 1066 was the Battle of Hastings. That was until I learned about the Grenada Massacre. On December 30 of that year:

"A Muslim mob stormed the royal palace in Granada, Spain on this date in 1066, crucified Joseph ibn Naghrela, the Jewish vizier to the Berber king, and massacred more than a thousand Jewish families. According to the 1906 Jewish Encyclopedia, "Arabic chroniclers relate that [the vizier] believed neither in the faith of his fathers nor in any other faith," and that he "controlled" the King and "surrounded him with spies." The most bitter of his enemies was Abu Ishaq of Elvira, who wrote a maliciously anti-Semitic poem that helped spark the pogrom..."

The exact number of deaths is unknown, but it is possible that up to 4000 people were killed. 

https://jewishcurrents.org/jewdayo-grid/december-30-the-grenada-massacre/

http://www.jewishencyclopedia.com/articles/6855-granada

http://jspacenews.com/december-30-1066-granada-massacre/