Some matters concerning the Crusades for this day in history…
1096 – First Crusade: Around 800 Jews are massacred in Worms, Germany. https://en.wikipedia.org/wiki/Worms_massacre_(1096)
1268 – The Principality of Antioch, a crusader state, falls to the Mamluk Sultan Baibars in the Siege of Antioch. https://en.wikipedia.org/wiki/Principality_of_Antioch
1291 – Fall of Acre, the end of Crusader presence in the Holy Land. https://en.wikipedia.org/wiki/Siege_of_Acre_(1291)