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. 1090 – 1153; died at about 63. Alive at the same time as Omar Khayyám, Saladin, Averroes, Zhu Xi, and Moshe ben Maimon. Wiki link