Denier - Boleslaus I the Brave unknown mint

Boleslaus I — Bolesław Chrobry — issued these deniers during the formative decades of the Polish state, barely a generation after the Piast dynasty's conversion to Christianity in 966. The coins drew heavily on Ottonian prototypes, reflecting both Poland's cultural orientation toward the Holy Roman Empire and Bolesław's calculated ambition to present himself as a legitimate Christian ruler. His coronation as the first King of Poland came only in 1025, at the very end of his life, meaning this issue circulated under a duke, not yet a king.

Attribution to a specific mint remains impossible. Gniezno and Poznań are the likeliest candidates, but no die evidence has settled the question.