French abbot Bernard of Clairvaux preached a sermon to a crowd at a council in Vézelay, with King Louis VII in attendance, urging the necessity of a Second Crusade. Bernard of Clairvaux: Bernard of Clairvaux, O.Cist., venerated as Saint Bernard, was an abbot, mystic, co-founder of the Knights Templar, and a major leader in the reform of the Benedictines through the nascent Cistercian Order. March 31, 1146. Wiki link