The answer is Piero della Francesca
To obey the Pope's call to free the Holy city from the infidels and ensure access for pilgrims. To be forgiven for past sins. The Pope offered forgiveness for anyone who took part. This was important for knights who had killed many people in battle. To see the world, have an adventure and prove their bravery.
The First Crusade is initiated when Byzantine Emperor Alexius Comnenus requests help in reconquering from the Seljuk Turks the lost territory of Asia Minor . Pope Urban II at the Council of Clermont calls upon the princes of Christendom for an armed “pilgrimage” to recover Jerusalem from the Muslims.
