IT is in answer to this that Letter 1 was written by S. Ambrose. It was written by the Emperor Gratian in his 20th year, four years after his succession to the Empire in partnership with his Uncle Valens and his younger brother Valentinian the 2nd, on the death of their father Valentinian the first, 375 A.D. Tillemont (Hist. des Emp. vol. v. p. 158.) calls it ‘une lettre toute pleine de piété et d’humilité, et d’ailleurs mesme écrite avec beaucoup d’esprit et d’elegance.’ THE EMPEROR GRATIAN TO AMBROSE BISHOP OF ALMIGHTY GOD. 1. GREAT is my desire that as I remember you though far away, and in spirit am present with you, so I may be with you in bodily presence also. Hasten then, holy Bishop[1] of God; come and teach me, who am already a sincere believer; not that I am eager for controversy, or seek to apprehend God in words rather than with my mind, but that the revelation of His Godhead may sink more deeply into an enlightened breast. Sidenote: creaturam. 2. For He will teach me, He Whom I deny not, but confess to be my God and my Lord, not cavilling at that created nature in Him, which I see also in myself. That I can add nothing to Christ I acknowledge, but I am desirous by declaring the Son to commend myself to the Father also; for in God I can fear no jealousy; nor will I suppose myself such an eulogist as that I can exalt His divinity by my words. Weak and frail, I proclaim Him according to my power, not according to His Majesty. 3. I beg you to bestow upon me the Treatise[2] you gave me before, adding to it an orthodox discussion on the Holy Spirit: prove, I beseech you, both by Scripture and reason, that He is God. God keep you for many years, my father, servant of the eternal God, Whom we worship, even Jesus Christ. LETTER I. A.D. 379. IN this letter S. Ambrose replies to the preceding. He apologises for not coming at once to Gratian, and, after praising his humility and faith, promises to come before long, and meanwhile sends him the two books (duos libellos) of the Treatise De Fide, which he had before composed at Gratian’s request, begging for time to write on the subject of the Holy Spirit. AMBROSE BISHOP TO THE BLESSED EMPEROR AND MOST CHRISTIAN PRINCE, GRATIAN.