The Blaubeuren monastery (Germany) is home to one of the most beautiful religious artistic expressions of Swabian art from the end of the 15th century, a collaborative work of various artists and workshops, including Jörg Syrlin the Younger, Michel Erhart, Hans Schüchlin, Bartholomäus Zeitblom, and Bernhard Strigel. It is a high altar triptych with a double opening. On its right inner bas-relief is “The Adoration of the Magi”, a work by Bartholomäus Zeitblom (ca. 1455–1520), a prominent member of the Ulm School. In the scene, on King Balthazar’s leg, there is a short literary text and a number, “DIER ZVO LIEB 100”, as well as a crowned monogram among floral elements. In this decipherment study, we propose meanings for all of these inscriptions, based on a collection of various previous solutions. The conclusions lead us to a pious expression toward the Child God based on an old Tyrolean Christmas carol compiled in the 19th century, which we trace back to at least the 15th century, an author’s signature by Zeitblom, and an acknowledgment of the royalty of the Virgin Mother Mary.