Paschasius Radbertus was a Carolingian theologian and the Benedictine abbot of Corbie, living from approximately 785 to 865. Raised by nuns in Soissons, he later joined the monastery at Corbie, where he served as abbot for several years. He is most famous for his influential treatise on the Eucharist, which argued for the real presence of Christ in the sacrament. This work helped shape authoritative Catholic belief regarding transubstantiation. He is recognized as a saint and is commemorated on 26 April.