24 It is not, therefore, surprising that the Catholic Ruthenian community has more than once desired, when opportunity offered, to give public expression to its gratitude for so many benefits and to its attachment to the Roman pontiffs. A notable instance occurred in 1895, the third centenary of the happy union of their fathers with the Apostolic See achieved at Rome and confirmed at Brest. Not only was the happy event recalled with appropriate celebrations in every part of Galicia, but a most distinguished delegation of the metropolitan and bishops was sent to Rome to express the love of the Ruthenian Church for the chief bishop, the successor of St. Peter, and to offer him their respect, reverence and obedience. Receiving this delegation with due honors, our predecessor Leo XIII addressed them with fatherly joy and benevolence, and he extolled the union of the Ruthenians with the Apostolic See as the salutary source of true light, unshakable peace and supernatural fruit to all those who sincerely held fast to it.
Source: Orientales Omnes Ecclesias (Vatican.va)