Richard of Saint-Victor was a 12th-century theologian and mystic, known for his work at the Abbey of Saint-Victor in Paris. He is best recognized for his writings on spirituality, particularly his emphasis on the importance of love and the inner life of the soul. His ideas contributed significantly to the development of medieval mysticism. Richard's most notable works include The Twelve Patriarchs and The Book of the Trinity, where he explored the relationship between God and humanity. His thoughts influenced later theologians and mystics, making him a key figure in the history of Christian thought.