The Council Fathers proposed to discuss about the role and the place that the Church has in today’s world and it was natural also to talk about the different utterances of the Church’s Catholicism. One of these form of utterance is represented by the Oriental Catholic Churches, of which reminds us the decree Orientalium ecclesiarum. There is one such Oriental Church in Romania: the Greek-Catholic Church. What role has this decree in the Church’s life? Did it bring something new in the tradition of the Catholic Churches with Oriental rites? This article wishes to answer to these questions.