Many Hungarian lords refused to accept Stephen's suzerainty even after his coronation. The new King first turned against his own uncle, Gyula the Younger, whose realm "was most wide and rich", according to the "Illuminated Chronicle". Stephen invaded Transylvania and seized Gyula and his family around 1002 or in 1003. The contemporary "Annals of Hildesheim" adds that Stephen converted his uncle's "country to the Christian faith by force" after its conquest. Accordingly, historians date the establishment of the Diocese of Transylvania to this period. If the identification, proposed by Kristó, Györffy and other Hungarian historians, of Gyula with one Prokuiwho was Stephen's uncle according to Thietmar of Merseburgis valid, Gyula later escaped from captivity and fled to Bolesław I the Brave, Duke of Poland (r. 992–1025).