The aim of this volume on Pirro Ligorio's worlds is to create for the first time a dialogue among renowned Ligorio specialists and emerging young scholars on various aspects of the artistic, antiquarian and intellectual production of one of the most fascinating and learned antiquarians in the prestigious entourage of Cardinal Alessandro Farnese. The book intends to step away, once and for all, from the almost Manichean approach that generated a distorted vision of his figure and works, especially trough the complex topic of his forgeries. The investigation of this aspect, that will reveal the necessity of a more nuanced study of this activity, is accompanied by an in-depth analysis of some neglected areas of Ligorio's life.