The king gets his own huge castle all to himself. The castle is surrounded by knights to protect the king.
Peasants work hard on the fields everyday. They farmed crops for their manor. They provided most of it to the nobles and kings.
The Christians in feudal Europe wanted to spread their religion and faith with was Christianity, spread opportunity for serfs and knights, and to win over the holy lands which would gain them more wealth.
The crusaders were in the lead during the first crusade making Jerusalem a crusader state.
In the next few crusades, Saladin became the leader of the muslims and took over the crusaders. They also took back control of Jerusalem and other lands.
In the end the crusades the feudal social classes did not win the holy land.