Heroes of the Crusades who changed the world

The history of mankind has a lot of short -term events that radically changed the lives of entire peoples and even civilizations. And only one of them falls out of the general row. These are the Crusades, which lasted for four centuries. Historical events serve as a background for a fascinating story about people of that era - with all their virtues and disadvantages, joys and sorrows, passions, weaknesses and dreams.
What lifestyle was the first soldiers in the history of Christianity? What privileges did the crusaders have? What was the first monument to the Crusades built from? What miracles and mystical events accompanied warriors? How did the hair of a beautiful captive save the life of one of the knights? What caused the divorce of the French king, and who was the queen to marry? Why did some wives of the crusaders not let their husbands home?