[NYer]

In order to establish this holy Church of His everywhere in the world until the end of time, Christ entrusted to the College of the Twelve the task of teaching, ruling, and sanctifying (cf. Mt 28:18-20 in conjunction with Jn 20:21-23). Among their number He chose Peter. After Peter’s profession of faith, He decreed that on him He would build His Church; to Peter He promised the keys of the kingdom of heaven (cf. Mt 16:19, in conjunction with Mk 18:18). After Peter’s profession of love, Christ entrusted all His sheep to him to be confirmed in faith (cf. Lk 22:32) and shepherded in perfect unity (cf. Jn 21:15-17).ii

Traditionalist ping

[NYer]

First, the Council of Trent both invited and offered safe passage to Protestants who wished to come and participate at this ecumenical council.

Second, Trent invited Protestants of all social and ecclesiastical rank to share their theological views, propose topics for debate, and generally participate in the daily affairs of this ecumenical council.

It seems Vatican II wasn't the first council to invite protestant "observers".