She agreed to give up Transylvania in exchange for Opole, Racibórz, and other territories so that her annual income would be 25,000 florins. For her domains in Hungary, which were valued at 140,000 florins, Isabella was to receive Ziębice, Ząbkowice Śląskie, and 100,000 florins in cash. John Sigismund was to marry one of Ferdinand's daughters. In August, Isabella gave up the Holy Crown of Hungary. According to Marcin Bielski, the cross atop of the crown was broken off and kept by John Sigismund who hoped one day to reunite the pieces. At the same time, John Sigismund was betrothed to 4-year-old Joanna of Austria. In September 1551, Isabella departed from Transylvania. According to a legend, when Isabella stopped to have a rest at the gates of Meszes, a border town, she cut the abbreviation of her motto into the bark of an old oak tree: SFV – Sic fata volunt ("It is the will of fate"). The same motto can be found on her jewelry and her coins. She reached Opole in March 1551 to find it devastated. The buildings where she was to live were unsuitable for habitation, the income was only half of what the treaty provided, and Ferdinand did not hurry to pay the agreed cash sums. Only a month later she departed Opole towards Poland where she lived with her family for the next five years. To provide her with income, her brother granted her Krzepice and Sanok, while her mother gave her Wieluń. Despite being outside the Duchy of Opole, she showed interest in its affairs. She influenced the appointment of the parish priest of the church in Prudnik and indirectly supported local Lutherans. Return to Transylvania The situation in Hungary was not stable. George Martinuzzi was assassinated in December 1551, while the Ottomans captured Cenad and unsuccessfully besieged Eger. Isabella received invitations both from Sultan Suleiman, who sent an envoy to Poland, and local nobles to return to Hungary, but she delayed. Her brother King Sigismund II Augustus, afraid of a Habsburg–Russian alliance in the series of the Muscovite–Lithuanian Wars, married Catherine of Austria, daughter of Ferdinand. Isabella and her mother Bona Sforza demanded that Ferdinand fulfilled his obligations according to the Treaty of Weissenburg, but he did not have financial resources to comply and asked for concessions. Isabella decided that since he did not hold up his end of the bargain, she was