It was a far more serious matter to invite "the bishops of the Oriental rite who are not in communion with the Apostolic See." An earnest and affectionate letter of invitation was addressed to them. It was presented to the Patriarch of the "Orthodox" Greek Church, who did not consider it worth while to open it. On the same day, it is related, four millions of Bulgarians notified to this patriarch their withdrawal from his jurisdiction. Many bishops of the Greek patriarchate were deeply moved by the most kind and pressing appeal of the Holy Father. He had beseeched and conjured them in the most earnest manner "to come to the general assembly of the bishops of the West and of the whole world, as their fathers had come to the second Council of Lyons and that of Florence, in order that, renewing the charity which existed of old, and restoring the peace which prevailed in the early ages, the fruits of which time has snatched from us, we may behold at last the pure and bright dawn of that union which we so ardently desire." The separated bishops to whom these touching words were addressed, appear to have been profoundly moved. A goodly number, even, actuated by the paternal intentions of the Holy Father, were strongly inclined to meet his advances; but so powerful was the example of the Greek Patriarch of Constantinople, that none of them dared to take the lead. The non-united Patriarch of Armenia replied that he would attend the council. But he failed to do so.
A very considerate letter was also addressed to Protestants and all non-Catholics. Needless to say it was not responded to. At the Council of Trent the same attention was shown, but with an equally unsuccessful result. Julius II. had published the condition on which alone non-Catholics generally could be invited, viz.: that they should recognize the Divine authority of the Church. It was not surely to be expected that, on occasion of the meeting of a General Council, the Catholic Church should abandon, in favor of a comparatively small number of dissenters, her fundamental claim to Divine commission, which was acknowledged throughout all Christendom. The bishops of the Anglican Church were astonished and irritated on finding that they were invited only as other Protestants, and not convoked along with the Fathers of the Council. Rome thus plainly intimated to them that they have yet to prove their consecration and right to episcopal dignity.