Pope Eugene III, born Bernardo Pignatelli, or possibly Paganelli, called Bernardo da Pisa, was head of the Catholic Church and ruler of the Papal States from 15 February 1145 to his death in 1153. He was the first Cistercian to become pope. In response to the fall of Edessa to the Muslims in 1144, Eugene proclaimed the Second Crusade. The crusade failed to recapture Edessa, which was the first of many failures by the Christians in the crusades to recapture lands won in the First Crusade. He was beatified in 1872 by Pope Pius IX.

The Cistercians, officially the Order of Cistercians, are a Catholic religious order of monks and nuns that branched off from the Benedictines and follow the Rule of Saint Benedict, as well as the contributions of the highly-influential Bernard of Clairvaux, known as the Latin Rule. They are also known as Bernardines, after Saint Bernard himself, or as White Monks, in reference to the colour of the "cuculla" or cowl worn by the Cistercians over their habits, as opposed to the black cowl worn by Benedictines.