On this day November 27, 1095
At the Council of Clermont, Pope Urban II called for the First Crusade, declaring holy war against the Muslims who had occupied the Holy Land and were attacking the Eastern Roman Empire.
Urban called the Council of Clermont to discuss the matter further. In convoking the council, Urban urged the bishops and abbots whom he addressed directly, to bring with them the prominent lords in their provinces.
The Council lasted from November 19 to November 28, and was attended by about 300 clerics from throughout France. Urban discussed Cluniac reforms of the Church, and also extended the excommunication of Philip I of France for his adulterous remarriage to Bertrade of Montfort.
On November 27, Urban spoke for the first time about the problems in the east, as he declared bellum sacrum against the Muslims who had occupied the Holy Land and were attacking the Eastern Roman Empire.