The Feast of the Conversion of St. Paul, Apostle and Martyr
is today. There is information on him here. He happens to be the patron of my diocese's Cathedral.

Stephen saw his Saviour; the next vision of that Saviour to mortal man was vouchsafed to that very young man, even Saul, who shared in his murder and his intercession. Strange indeed it was; and what would have been St. Stephen's thoughts could he have known it! The prayers of righteous men avail much. The first Martyr had power with God to raise up the greatest Apostle. Such was the honour put upon the first-fruits of those sufferings upon which the Church was entering. Thus from the beginning the blood of the Martyrs was the seed of the Church. Stephen, one man, was put to death for saying that the Jewish people were to have exclusive privileges no longer; but from his very grave rose the favoured instrument by whom the thousands and ten thousands of the Gentiles were brought to the knowledge of the Truth!
Herein then, first, is St. Paul's conversion memorable; that it was a triumph over the enemy. When Almighty God would convert the world, opening the door of faith to the Gentiles, who was the chosen preacher of His mercy? Not one of Christ's first followers. To show His power, He put forth His hand into the very midst of the persecutors of His Son, and seized upon the most strenuous among them. The prayer of a dying man is the token and occasion of that triumph which He had reserved for Himself. His strength is made perfect in weakness. As of old, He broke the yoke of His people's burden, the staff of their shoulder, the rod of their oppressor [Isa. ix. 4.]. Saul made furiously for Damascus, but the Lord Almighty "knew his abode, and his going out and coming in, and his rage against Him;" and "because his rage against Him, and his tumult, came up before Him," therefore, as in Sennacherib's case, though in a far different way, He "put His hook in his nose, and His bridle in his lips, and turned him back by the way by which he came." [Isa. xxxvii. 28, 29.] He "spoiled principalities and powers, and made a show of them openly," [Col. ii. 15.] triumphing over the serpent's head while his heel was wounded. Saul, the persecutor, was converted, and preached Christ in the synagogues.

Venerable John Henry Newman, Parochial and Plain Sermons

It is also, fittingly enough, the feast of St. Ananias of Damascus,Martyr .