Bernard of Clairvaux, O.Cist was a French abbot and a major leader in the reform of Benedictine monasticism that caused the formation of the Cistercian order.
"...[H]e was sent to found a new abbey at an isolated clearing in a glen known as the Val d'Absinthe, about 15 kilometres southeast of Bar-sur-Aube. According to tradition, Bernard founded the monastery on 25 June 1115, naming it Claire Vallée, which evolved into Clairvaux. There Bernard would preach an immediate faith, in which the intercessor was the Virgin Mary." In the year 1128, Bernard attended the Council of Troyes, at which he traced the outlines of the Rule of the Knights Templar, which soon became the ideal of Christian nobility.
On the death of Pope Honorius II on 13 February 1130, a schism broke out in the Church. King Louis VI of France convened a national council of the French bishops at Étampes in 1130, and Bernard was chosen to judge between the rivals for pope.