EN
The author discusses the letter of nuncio Mario Filonardi to King Ladislaus IV on April 19, 1638. In this letter the nuncio tries to persuade the king do not nominate an Orthodox bishop for Łuck cathedral, after the death of the uniate Bishop Jeremiah Poczapowski. By law, this bishopric should be taken by Athanasius Puzyna, an Orthodox bishop. The nuncio treated the Orthodox citizens of the Republic not only as “alien” Christians but also as “alien” in the Polish-Lithuanian State. Ladislaus IV was not convinced by Filonardi. The bishopric of Łuck was taken over by Bishop Athanasius Puzyna under the royal privilege of April 20, 1638.