Answer:
The first 3 Crusades
Explanation:
For the events, you could talk about the first three Crusades (history.com is very helpful).
Also, I don't know exactly how much this will help, but one of my all time favorite bands called Sabaton makes songs about historical events, including the Crusades (that one is called The Last Stand, it helps me remember what year the Crusades took place, my favorite though is about Japan called Shiroyama).