From the martyrology:
"At Nocera dei Pagani in Campani...St. Alphonsus Maria Liguori, founder of the Congregation of our most Holy Redeemer, bishop of Santa Agata dei Goti, and confessor. Noted for his zeal for souls, his writings, and his example, Pope Gregory XVI added him to the canon of saints, and Pius IX declared him to be a doctor of the Universal Church. Pius XII established him as heavenly patron of all moral theologians and of those who hear Confession...founder of the Congregation of our most Holy Redeemer, bishop of Santa Agata dei Goti..."
You can read more about the saint here.