Nüzhet-i Esrâr

The Nüzhet-i Esrâr also Sigetvarname, Topkapi Sarayí Müzesi, Hazine 1339, TSMK H.1339, is an Ottoman historical chronical by Feridun Ahmed Bey, transcribed in 1568/1569 and recounting the event of the Habsburg–Ottoman war of 1565–1568, particularly the Siege of Szigetvár in 1566. The miniatures are attributed to Nakkaş Osman, who accompanied Feridun Ahmed Bey in the Habsburg–Ottoman war of 1565–1568. His renditions of the scenes, and particucarly his portraits of Suleiman I are considered among the most realistic and accurate.
The campaign was led by Suleiman I, who died in Szigetvár on this occasion. He was succeeded to the throne by his son Selim II.