St. Andrew Corsini
St. Andrew Corsini lived from 1302 to 1373. While still carrying him in her womb, his mother dreamed she had given birth to a wolf that sauntered to the gate of the Carmelite monastery, and entering the vestibule of the church, was changed to a lamb. Andrew was reared as a pious and God-fearing youth, but little by little he succuмbed to the pleasures of the world in spite of frequent warnings and reproofs from his mother. After he became aware that his parents had vowed him to the service of Blessed Mary, he mended his ways and at the age of seventeen entered the Carmelite Order. Though persistently tempted and assailed by the devil, he never swerved from his holy decision. A man of austere penance, he fasted continuously, always wore a hair shirt, and prayed the penitential psalms daily. For humility's sake he often washed the feet of the poor and beggars. His special gift from God was the grace to effect the conversion of hardened sinners. In 1360, despite his efforts to the contrary, he was made bishop of Fiesole in Tuscany.

http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2015-02-04

Maybe we should ask for St Andrew's intercession in the conversion of certain notorious sinners.