Andrew Corsini was a 14th-century Italian Carmelite friar and the Bishop of Fiesole. Born into a noble Florentine family, he initially lived a dissolute life before undergoing a profound spiritual conversion following his mother's rebuke. He joined the Carmelite order, where he practiced intense asceticism, and later served as a diplomat and prelate. Known as the "Apostle of Florence," he was celebrated for his dedication to the poor and his ability to mediate between conflicting political factions. He died in Fiesole in early 1374.