De Mattei - Tu es Petrus: True devotion to the Chair of Saint Peter On Saturday April 8th 2018, at Deerfield (Illinois) at the invitation of Catholic Family News, and on Monday April 10th at Norwalk in Connecticut, as a guest of The Society of St. Hugh of Cluny, Professor Roberto de Mattei,  delivered addresses on the theme: Tu es Petrus: true devotion to the Chair of  St. Peter.  Here is the text of his conferences. Tu es Petrus: True devotion to the Chair of Saint Peter We find ourselves before one of the most critical moments that the...