He enforced yet again the Jus Piseti, i.e. the right of supervision over the mint at Körmöcbánya (present-day Kremnica, Slovakia), for which surveillance the archdiocese enjoyed a large revenue.

As Archbishop of Esztergom, Olahus exercised a supervision over the Diocese of Eger, and (with the consent of the Holy See) administered the Archdiocese of Kalocsa, vacant for 20 years.

As Primate of Hungary he threw himself with renewed energy into the conflict, aiming especially at the restoration of ecclesiastical discipline, the reformation of the clergy, and the establishment of new schools.

He organized a visitation of the archdiocese, which he in great part conducted in person, besides convoking, with a similar intention, a number of diocesan synods.

The first of these synods was held in 1560 at Nagyszombat; during its closing session he promulgated a code of dogmatic and moral instructions, intended for the clergy, published during that and the following year.

In 1561 a provincial synod was held, likewise at Nagyszombat, to discuss the participation of the bishops of Hungary in the Council of Trent, which had just re-convened.

While it is not certain whether Olahus took part in the Council, or if he promulgated in Hungary its decrees of 1562 and 1564, it is known that he followed its deliberations with close attention and put in practice some of its decisions.

In 1563 Olahus submitted to the council a lengthy memorial, in which he urged the importance of dealing with the critical situation of the Hungarian Church and describing in strong language the efforts he had made to overcome the demoralization that had seized on the clergy.