Politics, prophecy and satire : Atto of Vercelli's Polipticum quod appellatur Perpendiculum

This article presents a new interpretation of Atto of Vercelli's Perpendiculum: this cryptic work, composed between 953 and 960, is a peroration that adopts the structural model of the classical oratio, identifying usurpations as the cause of the political problems of post-Carolingian Europe. The text's aim is to denounce the usurpation that later led Otto I to definitively deprive Berengar II of his throne. The author's political discourse is a prophetic warning based on an eschatological reading of the political history of the Italian kingdom in the first half of the tenth century, analysed in depth by Atto. The crimes of the powerful are condemned in the cryptic and allusive style of classical satirical poets, within a work of considerable cultural ambition. The source adds significantly to our knowledge of the history of the Italian kingdom and conveys the author's specific assertion of the political role of the episcopate.