What social class made up the majority of those who fought in crusades?

The majority of those who fought in the Crusades were from the nobility and the warrior class, including knights and their retinues. However, many commoners, including peasants and townsfolk, also participated, especially in the earlier Crusades, motivated by religious fervor, the promise of land, or the hope of adventure. Overall, the crusading forces were predominantly composed of individuals from the upper and lower nobility, with a significant contingent of common people joining as well.