On 7 October 1698 he convened the "Union
Synod" in Gyulafehérvár. The Act of Union with the
Catholic Church was signed not only by Anghel, but by all members of the Synod (38 district
protopopes and 2,270 priests), and sealed with the seal of the Metropolitan Archbishopric of Gyulafehérvár (
Mitropolia Bălgradului in old
Romanian language). The
Transylvanian Diet, controlled by Protestants, did not look favorably upon the confessional issues of the Romanian people. Large land holders began to persecute the new Romanian
Greek-Catholic priests, a situation which Atanasie Anghel had to cope with. Protestant noblemen encouraged revolts among peasants opposed to joining the Catholic Church. Under these circumstances, the bishop Atanasie Anghel convened a new synod, also held at Gyulafehérvár on 4 September 1700. This was attended not only by protopopes and priests, but also by three laymen delegates from each Romanian inhabited village. The 54 protopopes, together with the priests and all the delegations present, signed a new act which reinforced the decision of the synod of 1698, reaffirming religious unification of Romanians in Transylvania with the Catholic Church. For Greek-Catholic bishop Atanasie Anghel, there followed years of hardship, being attacked by
Calvinists and also by the Orthodox
Archdiocese of Bucharest. He was summoned to
Vienna to give explanations. Under these circumstances, on 7 April 1701 he made a statement that he no longer recognized the Archbishop of Bucharest as his superior. ==Business activities==