One of a series of 22 portraits of Polish kings commissioned for the Marble Room at the Royal Castle in Warsaw. The painting is listed in the 1795 catalogue of the Stanisław August collection under no. 1157. Bolesław I Chrobry (967–1025), Duke of the Piast dynasty (reg. 992–1025), crowned King of Poland in 1025. Inscribed on the back: BOLESLAUS/ CHRABRY seu FORTIS/ Primus in Polonia/ Regio Diademate ornatus/ Terminos Imperij ad Albim/ Tyram & Borysthenem/ Victor designavit./ Obijt Ao 1025. AEtatis. 58./ Regni vero 25./ Nro 1 The marble plaque beneath the painting is inscribed: BOLESLAS CHRABRY/ PRIMUS REX/ + MXXV.