Everyone has heard in school about the so-called Donation of Constantine, often presented as the archetype of a forged document intended to alter history. However, not everyone knows that the apocryphal nature of this imperial edict was exposed by Lorenzo Valla (1407–1457), a humanist and canon of the Lateran Basilica. Listen to Don Andrea Lonardo, Director of the Catechetical Office and the Catechumenate Service of the Diocese of Rome.