The Bishop of Fiesole being dead, the Church in that place chose Andrew Corsini for his successor. He held himself altogether unworthy of that office, and for a long time lay hidden and unknown, till he was betrayed by the voice of a child marvellously speaking, and found outside the city. Then, lest he should seem to resist the Will of God, he took the Bishoprick. Being dignified with this office, he set himself to a more perfect exercise of the virtue of lowliness, whereof he was already a diligent practiser. He was eminent in watchfulness over the flock committed to his charge, joining thereto great tenderness and liberality towards the poor. He continued instant in prayer and watching. Thus was he so adorned with these and many other virtues, and even with the gift of prophecy, that the fame of his holy life was in the mouths of all men.
Urban V, moved by the fame of his godly conversation, sent him as his Legate to quiet disturbances at Bologna. He endured much in the discharge of this duty, calming with great wisdom the angry passions of the citizens, who had broken out into civil war, and when peace was restored, he returned home. Shortly after, he received from the Blessed Virgin a warning of his approaching death, and being worn out with his unceasing toil. and the rigour of his voluntary mortifications, he passed to the kingdom of heaven, in the year of our Lord 1373, and the 71st of his own age. His name became illustrious for many and great miracles, and Urban VIII enrolled him in the number of the Saints. His body resteth at Florence in the Church of his Order, and is looked on with great reverence by the citizens, to whom, even in these days, he hath more than once shewn himself a protéctor.