William of Saint-Thierry (ca. 1080 1148) became abbot of the Benedictine abbey of Saint-Thierry in about 1119, holding that office for about sixteen years and writing a large number of works, some for the guidance of the monks of his abbey and others as theological treatises. But during that same time, after meeting Bernard, abbot of the Cistercian abbey of Clairvaux, he longed to become a Cistercian. He finally satisfied that dream in 1135, when he became a monk at Signy. His final work was the first of the five books that constitute the "Vita Prima Sancti Bernardi.