Moral Theology (also known as the Theologia Moralis) is a nine-volume work concerning Catholic moral theology written between 1748 and 1785 by Alphonsus Liguori, a Catholic theologian and Doctor of the Church. This work is not to be confused with Theologia moralis universa ad mentem S. Alphonsi, a 19th-century treatise by Pietro Scavini written in the philosophical tradition of Alphonsus Liguori.[1]