The Habsburg-led Holy Roman Empire continued to hold its claim to Prussia and furnished grand masters of the Teutonic Order, who were merely titular administrators of Prussia, but managed to retain many of the Teutonic holdings elsewhere outside of Prussia. Joachim II Hector, Elector of Brandenburg, who had converted to Lutheranism in 1539, was after the co-enfeoffment of his line of the Hohenzollern with the Prussian dukedom. So he tried for gaining his brother-in-law Sigismund II Augustus of Poland and finally succeeded, including the then usual expenses. On 19 July 1569, when Albert Frederick rendered King Sigismund II homage and was in return enfeoffed as Duke of Prussia in Lublin, the King simultaneously enfeoffed Joachim II and his descendants as co-heirs.