18 But God does not permit his people to be tried by excessive affliction and at length, after the peace of Andrussovia in 1667, he bade more peaceful days dawn for this people after so many trials and perils. The peace thus obtained resulted daily in greater blessings for our holy religion. In fact Christian faith and Christian morals so flourished that in the two eparchies which in 1596 had unhappily remained separated from unity opinion every day grew more favorable to a return to the Catholic fold. Thus it happily came about that in 1691 the eparchy of Przemysl, and in 1700 that of Lvov were united to the Apostolic See, and so, that almost the whole of the Ruthenian people then inhabiting Poland were in enjoyment of Catholic unity. All prospered more from day to day, to the great gain of Christianity, and so in 1720 the metropolitan and the rest of the bishops of the Ruthenian Church met in council at Zamosc to provide to the best of their ability by common counsel for the growing needs of the faithful; from the decrees of this council - confirmed by our predecessor Benedict XIII in the Apostolic Constitution Apostolatus officium of 19th July 1724 - no small benefit resulted to the Ruthenian community.
Source: Orientales Omnes Ecclesias (Vatican.va)