taxes. Although the revolt was led by Hungarian noble Antal Nagy de Buda, it consisted of a coalition of various elements of Transylvanian society. This included Hungarian and Romanian serfs as well as the burghers of Kolozsvár (Klausenburg, Cluj), and resulted in the lower taxes codified by the Treaty of Kolozsmonostor. Pál Vajdaházi, one of the leaders of the revolt, was referred to in this document as (Standard-bearer of the Union of Hungarian and Romanian inhabitants of this province of Hungary). Consequently, it is possible that the rebels considered themselves inhabitants of the Estate of Hungarians and Romanians (). Brotherly Union (Union of Kápolna) Despite the pressing issues at hand, the Transylvanian Diet was still not called together by the Voivode, resulting in the various nobles initiating a meeting of the three nations. After a gap of almost half a century, the estates now had the opportunity to discuss Transylvanian issues together. On this occasion, the nobles set up an alliance with Székelys and Saxons who were still afraid of possible Ottoman incursions. The alliance of mutual aid, signed in Kápolna (present-day (Căpâlna), was called the Fraterna Unio (Brotherly Union), and was designed to protect the parties both from revolts and Ottoman attacks. While the existence of the Union helped the indigenous inhabitants to re-negotiate and partly modify the terms of the previous agreement, the alliance did not organize any serious military operations until the end of 1437. At that time, the alliance defeated the opposition after the death of King Sigismund in December. Founding of the Union of Three Nations After the successful campaign, the alliance of Hungarian nobles, Székelys, and Saxon elite was codified in the Unio Trium Nationum ("Union of Three Nations") on February 2, 1438. Like the Brotherly Union, the new Union provided mutual aid against peasant revolts and Ottoman attacks. The Union ensured that the (Hungarian and Romanian) serfs continued to be excluded from the political life of Transylvania, although they were the majority of the population in the Noble Counties (Comitates). The Romanians adhered to Eastern Orthodoxy, which in predominantly Catholic Hungary was considered heretical. The alliance of the three privileged estates was effective for centuries and provided the framework of internal and international relations of Transylvania. After the 18th century, when the danger of Ottoman or Tatar attacks was over, the Union became an alliance of the three estates to protect their vested