What year did Transylvania become a territory of the Habsburg ' Austrian empire ?
The Calvinist magnate of Bihar county Stephen Bocskai managed to obtain , through the Treaty of Vienna ( June 23 , 1606 ) , religious liberty and political autonomy for the region , the restoration of all confiscated estates , the repeal of all " unrighteous " judgments , as well as his own recognition as independent sovereign prince of an enlarged Transylvania .