In Four Books,

written to boniface, bishop of the roman church, in opposition to two letters of the pelagians, a.d.420, or a little later

Book I.

Augustin replies to a letter sent by Julian, as it was said, to Rome; and first of all vindicates the catholic doctrine from his calumnies; then discovers and confutes the heretical sense of the Pelagians hidden in that profession of faith which the author of the letter opposed to the catholics.