Aelred of Rievaulx was a 12th-century Cistercian monk and abbot known for his spiritual writings and leadership. Born in 1110 in Northumbria, England, he joined the Cistercian order at the monastery of Rievaulx in 1133. Aelred became the abbot of Rievaulx in 1147 and played a significant role in the expansion of the Cistercian community in England. Aelred is best known for his works on spirituality, particularly his treatise on friendship, which emphasizes the importance of love and community in the Christian life. His writings reflect a deep understanding of human relationships and the pursuit of divine love, making him a significant figure in medieval Christian thought.