Which 12th-century abbot and theologian, based at the monastery of Clairvaux, preached the Second Crusade and was a key driver of Cistercian monastic reform?

• A Bernard of Clairvaux (Saint Bernard) ✓
• B Peter Abelard
• C Thomas Aquinas
• D Anselm of Canterbury

Bernard of Clairvaux was one of the most influential churchmen of the Middle Ages, a mystic, reformer, and political powerbroker.