The First Crusade was a military campaign launched by the Christian states of Europe in the late 11th century with the goal of reconquering the Holy Land from Muslim rule. The crusade was a success, achieving its goal of establishing Christian control over the Holy Land, and it had a number of key factors that contributed to its success.
One reason for the success of the First Crusade was the strong leadership of its leaders. The main leaders of the crusade, such as Godfrey of Bouillon and Bohemond of Taranto, were able military leaders who were able to rally and organize the large, diverse group of crusaders. They were able to effectively coordinate the efforts of the different armies and ensure that they were working towards a common goal.
Another factor in the success of the First Crusade was the strong motivation of the crusaders. Many of the crusaders were driven by a sense of religious devotion and a desire to defend their faith. They saw the crusade as an opportunity to serve God and to fight against what they saw as the oppression of the Muslim rule in the Holy Land. This strong motivation helped to sustain them through the challenges and hardships of the crusade.
The First Crusade also benefited from the political and military support of the Byzantine Empire. The Byzantine Emperor, Alexios I Komnenos, saw the crusade as an opportunity to strengthen his own position and to gain allies in his conflicts with the Muslim states. He provided the crusaders with supplies, logistical support, and access to his territories, which helped to make their campaign more effective.
Finally, the First Crusade was successful in part due to the internal conflicts and divisions among the Muslim states in the Holy Land. The Seljuk Turks, who controlled much of the region, were divided and weakened by internal struggles, which made it easier for the crusaders to conquer their territory. Additionally, the Fatimid Caliphate, which controlled the city of Jerusalem, was also weakened by internal conflict and was unable to effectively resist the crusader invasion.
Overall, the success of the First Crusade was due to a combination of strong leadership, motivated crusaders, political and military support, and internal conflicts among the Muslim states. These factors all contributed to the crusade's ability to achieve its goal of establishing Christian control over the Holy Land.