Peritus

Cardinal Yves Congar served as a consultant to the council upon the invitation of Pope John XXIII, but was hired as personal and expert theologian (peritus) at the council to Bishop Jean-Julien Weber of Strasbourg. This allowed him to attend all the general sessions and participate in discussions of any commission to which he was invited.

The periti of Vatican II, although their official status designates them as at the service of the council, were most often at the service of the currents which clashed at the council, either on the side of a reform of the church (acceptance of religious freedom, revision of church–state relations, reassessment of relations with other religions), or on the side of the continuation of a clash of Catholicism with the other institutions and currents of society, in the wake of the councils of Trent and Vatican I (especially for the experts close to Coetus Internationalis Patrum).

As for the US, there were 86 periti altogether during the four sessions of the council.