A unique medal struck on the occasion of Sigismund Augustus beginning his reign in 1548. It was the only moment in the history of Poland when a king was elected and crowned while his predecessor, i.e. Sigismund I the Old, was still alive (vivente rege). From the artistic point of view, the medal is a masterpiece of Renaissance medallic art, yet not much is known about its maker – Dominic of Venice. The decoration is signed with the artist’s full name, which was rare in the early 16th century. The copy stored in the Ossolineum collection is the only specimen of that medal cast in gold.