A necessary missing piece of the puzzle, one which few scholars would have had the intellectual courage and scientific prowess to write. Franco Cardini, Il Sole 24 Ore

The extraordinary character of Frederick II of Sweden reveals the intellectual ambitions and preoccupations of Medieval Europe. Alessandro Barbero, Tuttolibri

An opportunity to reflect on those values of civil life on which the sun never sets, and on a figure that continues to mesmerize us. Armando Torno, Corriere della Sera

Against the backdrop of an era of great upheaval, an historian of ideas maps the extraordinary adventure of a medieval intellectual: the triumphs and failures, the projects, dreams and betrayals of a ruler who has entered the annals of history.