At the Second Vatican Council (1962?1965), Ratzinger served as a peritus or chief theological expert to Josef Cardinal Frings of Cologne, Germany, and has continued to defend the council, including Nostra Aetate, the document on respect of other religions and the declaration of the right to religious freedom. He was viewed during the time of the council as a liberal.
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Ratzinger e o Vaticano II
Ratzinger was a liberal theological adviser at the Second Vatican Council