The letter is addressed to an otherwise unknown Picard countryman named Sygerus (Sigerus, Ysaerus) of Foucaucourt, possibly a friend and neighbor of the author; Foucaucourt borders on the home area of Peregrinus around Maricourt, in the present-day department of the Somme, near Péronne.
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In only one of the 39 surviving manuscript copies the letter also bears the closing legend Actum in castris in obsidione Luceriæ anno domini 1269º 8º die augusti ("Done in camp during the siege of Lucera, August 8, 1269"), which might indicate that Peregrinus was in the army of Charles, duke of Anjou and king of Sicily, who in 1269 laid siege to the city of Lucera.
Petrus Camper | Petrus Plancius | Petrus | Petrus Ramus | Petrus Christus | Lars Petrus | Jacques Fred Petrus | TONUS PEREGRINUS | Tonus Peregrinus | Petrus Van der Velden | Petrus Hofstede de Groot | Petrus de Natalibus | Petrus Codde | Petrus Canisius van Lierde | Petrus Astronomus | Petrus Alphonsi | Petrus Alfonsi's Tetragrammaton | Joseph Petrus Hendrik Crowe |