Andrea Gallerani was a 13th-century soldier and religious figure from Siena who established the Frati della Misericordia. After killing a man he believed was a blasphemer during a moment of anger, he was forced into exile. This experience prompted a profound spiritual transformation, leading him to seek a life of penance. Upon returning to his home city, he dedicated himself to charitable works and founded both a hospital and a religious association to serve the community.