Odulf of Stavoren was a ninth-century Frisian missionary and Benedictine monk who served as a priest and canon. Born into a noble family, he dedicated his life to reforming the religious practices of the Frisians through tireless labor and prayer. After years of missionary work, he spent his final years in Utrecht, where he died in the mid-ninth century. He is recognized as a saint in the Catholic tradition for his piety and his efforts to spread the faith.