The Princes Polonie denar is one of the oldest and most interesting Polish coins. It was struck at the very beginning of the 11th century during the reign of Bolesław I the Brave and continues to elicit interest among scholars due to its uniqueness due to the two elements placed on it—a bird and the word Polonie. One of these elements—the bird—was formerly considered to be the White Eagle—later the national coat of arms of Poland. Some hypotheses suggest it was a dove, or even a rooster. All these hypotheses are now considered obsolete, and the bird itself, as evidenced by research, is most likely a peacock. The second element raises no doubts—the word Polonie is the oldest [written] record of the name of the Polish state. The motifs on the oldest Polish coins, including the Princes Polonie denar, draw on various patterns. Thus the long cross on the reverse was inspired by the CRVX-type Anglo-Saxon coins of Ethelred II; the bird itself comes from the coins of the Bohemian Slavníks, whereas the title Princes comes from the Italian coins of Benevento. Therefore, Bolesław the Brave’s coin is a native transformation of images on coins that were in circulation across Europe.