Denier - Anonymous Boleslaus I, bishop

Boleslaus I of Silesia ruled a duchy carved from the fragmentation of Poland following the 1138 Testament of Bolesław III Krzywousty, which deliberately divided the Piast realm among his sons to prevent primogeniture conflict — and in doing so guaranteed two centuries of internecine struggle instead. These anonymous deniers, issued without the duke's name, reflect the ecclesiastical minting conventions common to Silesian issues of this period, where episcopal authority and ducal power overlapped uneasily in controlling coin production.

At 0.3g, surviving examples are frequently found clipped or bent — a known characteristic of Silesian bracteate-adjacent issues circulating in this region during the late twelfth century.