Alanus de Rupe was a 15th-century Dominican friar, theologian, and mystic born in Brittany. A dedicated university teacher, he lectured at various institutions including Paris, Lille, and Ghent before becoming a Master of Sacred Theology in Germany. He is most widely recognized for his efforts to revive and spread the devotion to the Rosary throughout northern Europe. By establishing a confraternity dedicated to the Psalter of the Glorious Virgin Mary, he played a central role in disseminating this prayer practice during his lifetime.