The reform of the Council of Trent made great influence on the liturgical development of all Europe. That was also the fact in Hungary: in 1630 the local synod of Nagyszombat accepted the introduction of the Tridentine rite into the Hungarian Church. Nevertheless some of dioceses - existed more independently - protested against this decision and insisted on the continuation of their own medieval traditions. Among these dioceses Zagreb was the greatest “Protestant”. The cathedral itself guarded his medieval tradition till 1788. Through this largely documented processional practise of Zagreb Cathedral (ten manuscripts and one printed processional from the 14th up to the 18th centuries) one can follow the particularities of a liturgy preserved isolated: the basically remained liturgical chants were influenced by some new practise, mainly simplifications but additions as well.