Catholic priest, preacher, and writer. Director of the Arch-confraternity of Christian Mothers. Brother of Maria Alphonse Ratisbonne. Born in 1802 in Strasbourg, Alsace-Lorraine; died in 1884 in Paris, France. Converted from Judaism, he embraced Catholicism in 1826, and was ordained in 1830. He obtained permission from Pope Gregory XVI to work as a missionary around Jerusalem. Established the Order of Our Lady of Sion for the Christian education of Jewish boys and girls. He wrote a biography of Saint Bernard, a Manual for Christian Mothers, and Meditations of Saint Bernard.