1. Godfrey of Bouillon: He was the Duke of Lower Lorraine and one of the most powerful crusaders. He played a key role in the siege and capture of Jerusalem and was elected as the first ruler of the Kingdom of Jerusalem.
2. Raymond IV, Count of Toulouse: He was one of the wealthiest and most powerful nobles in France. He led a large contingent of southern French crusaders and was a prominent leader during the siege of Antioch.
3. Bohemond I of Taranto: He was the Prince of Taranto in southern Italy and one of the most ambitious and skilled military leaders of the First Crusade. He played a crucial role in the capture of Antioch and founded the Principality of Antioch.
4. Robert Curthose, Duke of Normandy: He was the eldest son of William the Conqueror and the Duke of Normandy. He joined the First Crusade to fulfill his religious vows and gain fame and glory.
5. Stephen, Count of Blois: He was the Count of Blois and Chartres and one of the most important nobles in northern France. He contributed significantly to the First Crusade with his military forces and resources.
6. Hugh of Vermandois: He was the Count of Vermandois and the brother of King Philip I of France. He participated in the First Crusade with a large contingent of French knights.
7. Ademar of Le Puy: He was the Bishop of Le Puy and the papal legate to the First Crusade. He played a vital role in maintaining unity among the crusaders and providing spiritual guidance.
These leaders, along with many other nobles, knights, and churchmen, formed the leadership of the First Crusade and contributed to its success in capturing Jerusalem and establishing several Crusader states in the Holy Land.