摘要:The author asks whether it's possible today to compose, according to a shared methodology, the most adverse interpretations about the hermit and cardinal of Ostia. This study aims to identify trends, adaptability and originality of Petrus Damiani's ecclesiological thought, with regard to pressing emergencies of the Reformation, focusing on relations between mystical Church and historical Church, between pope and emperor, and also on judicial powers of the Roman Church and on the Petrine primacy.