Which saint is known as the 'Doctor of Grace'?

Which saint is known as the “Doctor of Grace”? Saint Augustine of Hippo is known as the “Doctor of Grace,” or Doctor Gratiae.

Augustine was born in 354 at Thagaste in Roman North Africa and became bishop of Hippo Regius. After a long intellectual and spiritual journey—including study of rhetoric, Manichaeism and Neoplatonism—he converted to Christianity and was baptized by Saint Ambrose in Milan in 387.

The title refers to Augustine’s influential teaching on divine grace, especially his argument that salvation depends on God’s unmerited and prevenient grace rather than human achievement alone. His debates with Pelagius and the Pelagians made grace, sin, free will and predestination central themes in Western Christian theology.

Augustine’s major works include Confessions, The City of God, On the Trinity and On Christian Doctrine. He died in 430 during the Vandal siege of Hippo. Along with Ambrose, Jerome and Gregory the Great, he is one of the four Great Latin Church Fathers; the Catholic Church formally recognized him as a Doctor of the Church in 1298.