Summary: This introduction to Richard of St. Victor's pneumathology seeks to deepen our understanding of the Trinitarian theology found in his De Trinitate – with particular attention to the Third Person of the Blessed Trinity: His procession from the Father and Son and His physiognomy within the Trinitarian Mystery. Attention is given to Richard’s argumentum amoris and notion of condilectio and an understanding of the Holy Spirit as Amor debitus and Donum. The author’s conclusion serves as an excellent springboard for further theological research and reflection.