This 5 groszy red stamp from Poland, issued in 1938, commemorates the historic Congress of Gniezno in the year 1000 AD. It depicts King Bolesław I Chrobry (Boleslaus the Brave) receiving Emperor Otto III, a moment symbolizing Poland’s early recognition within Christian Europe. Designed by W. Boratyński and engraved by M. Dutczyński, the stamp honors the Polish monarchy’s medieval origins and the establishment of the first Polish archbishopric in Gniezno. A key piece in Polish historical philately, it reflects both national pride and artistic mastery of interwar engraving.