Aelred of Rievaulx (1110–1167)

Cistercian abbot, author of Spiritual Friendship. Aelred of Rievaulx, also known as Ailred, Ælred, or Æthelred; was an English Cistercian monk and writer who served as Abbot of Rievaulx from 1147 until his death. He is venerated by the Catholic Church as a saint and by some Anglicans.