While the council is known today primarily for the speech Pope Urban gave on the final day, it was primarily a synod focused on implementing the Cluniac reforms, enacting decrees and settling local and regional issues. This also included the extension of the excommunication of Philip I of France for his adulterous remarriage to Bertrade of Montfort and a declaration of renewal of the Truce of God, an attempt on the part of the church to reduce feuding among Frankish nobles.
Pope Urban's speech on 27 November included the call to arms that would result in the First Crusade, and eventually the capture of Jerusalem and the establishment of the Kingdom of Jerusalem.
The image comes from the Passages d'outremer, a chronicle of the Crusades published and illustrated three centuries after this event, and isn't particularly historically accurate, but also considered a masterpiece of mediaeval illustration, and a document showing the 15th-century interpretation of the crusading movement.Jean Colombe