What year did Transylvania become a territory of the Habsburg ' Austrian empire ?
In 1568 , the Edict of Turda proclaimed four religious expressions in Transylvania - Latin Rite or Eastern Rite Catholicism , Lutheranism , Calvinism and Unitarianism ( Unitarian Church of Transylvania ) , while Eastern Orthodoxy , which was the confession of almost the entire ethnic Romanian part of the population , was proclaimed as " tolerated " ( " tolerata " ) .