text: In addition to the Székely and Saxon leaders, the noblemen formed one of the three nations (or Estates of the realm) in Transylvania, but they could rarely challenge the princes' authority. In Royal Hungary, the magnates successfully protected the noble privileges, because their vast domains were almost completely exempt from royal officials' authority. Their manors were fortified in the "Hungarian manner" (with walls made of earth and timber) in the 1540s. Noblemen in Royal Hungary could also count on the support of the Transylvanian princes against the Habsburg monarchs. Intermarriages among Austrian, Czech and Hungarian aristocrats gave rise to the development of a "supranational aristocracy" in the Habsburg monarchy. Foreign aristocrats regularly received Hungarian citizenship, and Hungarian noblemen were often naturalized in the Habsburgs' other realms. The Habsburg kings rewarded the most powerful magnates with hereditary titles such as baron from the 1530s.
  The aristocrats supported the spread of the Reformation. Most noblemen adhered to Lutheranism in the western regions of Royal Hungary, but Calvinism was the dominant religion in Transylvania and other regions. John Sigismund promoted Unitarian views, but most Unitarian noblemen perished in battles in the early 1600s. The Habsburgs remained staunch supporters of the Catholic Counter-Reformation and the most prominent aristocratic families converted to Catholicism in Royal Hungary in the 1630s. The Calvinist princes of Transylvania supported their co-religionists. Gabriel Bethlen granted nobility to all Calvinist pastors.
  The kings and the Transylvanian princes regularly ennobled commoners, but often without granting landed property to them. Jurisprudence maintained that only those who owned land cultivated by serfs could be regarded as fully fledged noblemen. Armalistsnoblemen who held a charter of ennoblement, but not a single plot of landand peasant-nobles continued to pay taxes, for which they were collectively known as taxed nobility. Nobility could be purchased from the kings who were often in need of funds. Landowners also benefitted from the ennoblement of their serfs, because they could demand a fee for their consent.