La "ruota armonica". Pitagorismo e scienza moderna in Federico Borromeo

Since his youth Federico Borromeo had shown an ardent desire for knowledge that drove him to delve into a broad variety of disciplines, which included Pythagoreanism. This corpus of teachings became vital in early modernity due to the debate over heliocentrism, but also on account of its intersection with the occult arts. This note presents the main aspects of 'De pythagoricis numeris', one of the three published works of the archbishop of Milan focusing on Pythagoras and his school, which has been generally overlooked in historiography.