Participants: Nassir Abdulaziz Al-Nasser, United Nations High Representative for the Alliance of Civilizations; Saifallah Lasram, Mayor of Tunisi; Dario Nardella, Mayor of Florence. On occasion of the conference, screening of a video-interview of Marcelo Sánchez Sorondo, Chancellor of the Pontifical Academy of Sciences. Introduced by Andrea Simoncini, Professor of Constitutional Law at the University of Florence.