I will address the topic of Christianity and Islam by limiting myself to a brief presentation of historical facts, without entering into the specifics of religious and theological dialogue. This seems useful to me, because the celebration of the fifth centenary of the birth of Pius V was a bit muted, especially in academic circles. The victor at Lepanto in 1571, this pope who had the courage and the energy to construct an alliance of almost all the Christian kingdoms against the Ottoman empire – which was advancing to threaten Europe and had already established dominion over the Balkans –...