The Crusades were a series of religious conflicts between Christians and Muslims that were mostly waged to seize possession of sacred locations that were revered by both religions.
The majority of historians believe that Pope Urban II's sermon delivered at Clermont-Ferrand in November 1095 served as the impetus for a series of military operations to liberate the Holy Land from Muslim rule.
The Siege of Acre, which was shown in the first episode of Knightfall, was the pivotal event. It resulted in the Templars and their Crusader brethren's brutal defeat. It was only a matter of time before the Christian presence in the Holy Land was eradicated; Acre was their last significant stronghold.
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