Translation / modern text
The letter mentions envoys and matters concerning Prussia, Gdańsk, and Warsaw; some Latin fragments are also legible. The dateline gives Lviv, 17 January 1703. Page 56 is the folded wrapper addressed to the Palatine/Voivode of the Ruthenian lands.
Original wording — transcription
[Nagłówek:] Monseigneur.
[…] posłów […] Prus […] Gdańska […] Warszawy […]
[…] [fragment łaciński nieczytelny].
[Datownik:] ze Lwowa d. 17 January 1703.
[Adres na obwolucie, s. 56:] A Son Excellence Monseigneur le Palatin General de Russie à Leopoli.
Reading notes
Page 55 contains the letter text and ending; p. 56 is its folded wrapper/address. Date and Lviv are read from the dateline on p. 55.