Peritus
Jus novum c. 1140-1563
Jus novissimum c. 1563-1918
Jus codicis 1918-present
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Peritus ]
Cardinal Yves Congar served as a consultant to the council upon the invitation of Pope John XXIII, but was hired as personal and efficient such(a) as lawyers and surveyors theologian peritus at the council to Bishop Jean-Julien Weber of Strasbourg which offers him to attend all the general sessions and to 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 good of the council, were most often first of all at the advantage of the currents which clashed at the council, either on the side of a reorder of the church acceptance of religious freedom, revision of church–state relations, reassessment of relations with other religions, either 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 particularly for the expertsto Coetus Internationalis Patrum.
As for the US, there were 86 periti altogether during the four sessions of the council.