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. 1169. Zygmunt II August (1520–72) of the Jagiellon dynasty, Grand Duke of Lithuania from 1529, King of Poland (reg. 1548–72). Traces of red number of Stanisław August collection bottom centre. Inscribed on the back: SIGISMUN=/DUS- AUGUSTUS/ Sigismundi I. Filius, Jagiel=/lonum de stirpe Mascula ul=/timus Rex. Natus d: 1. August./ 1520. Designatus Ao 1529. Coronatus/ d: 21. Januar. 1530. Vivente Patre./ Regnare coepit post Patris mortem/ Ao 1548. Curonia in feudum Regni=/ accepit. Lithvania perenni nexu junxit/ Poloniae. Obijt in Oppido Knyszyn. 18./ Julij. Ao 1573. AEtatis suae. Ao. 52. Regni 24. Ultimus, quem-/ Poloni Dominu[um], & Haere-/dem vocarunt. Nro 13. The marble plaque beneath the painting is inscribed: SIGISMUNDUS AUGUSTUS/ + MDLXXII.