http://en.wikipedia.org/wiki/Bernard_of_Clairvaux
Bernard of Clairvaux, O.Cist (1090--August 20, 1153) was a
French abbot and the primary builder of the reforming
Cistercian order.
After the death of his mother, Bernard sought admission into
the Cistercian order. Three years later, he was sent to
found a new abbey at an isolated clearing in a glen known as
the Val d'Absinthe, about 15 km 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 assisted at the Council of Troyes,
at which he traced the outlines of the Rule of the Knights
Templar, who soon became the ideal of Christian nobility.
Bernard died at age 63, after 40 years spent in the
cloister. He was the first Cistercian monk placed on the
calendar of saints, and was canonized by Pope Alexander III
on 18 January 1174. Pope Pius VIII bestowed upon him the
title "Doctor of the Church".