"According to the rabbinic legal tradition, an act repeated three times becomes chazaqà, fixed custom" - so said Rabbi Di Segni in the temple of Rome. He alluded to the third visit of a Pope to the synagogue, that of Francis: "The concrete sign of a new era after all that has happened in the past". Now the visit is a decisive step for the Popes, a sign of the ''essential link" between the Church and Jews (in the words of Francis). Really a new era. Roman Jews, for centuries ...