The following are the events of crusades and their descriptions elaborating the details on who organized them, when they were organized, what were the causes, what caused the crusades, and what were they aimed at:
First Crusade - Caused distrust between Byzantine and Catholic Christians.
Second Crusade - Organized by King Louis VII of France and the German emperor Conrad III.
Third Crusade - Organized in 1189 to recapture Jerusalem after it fell to Saladin.
Fourth Crusade - Aimed to recapture Edessa.