Sigismund's realm became a legal successor of the medieval Diet of Hungary. Laws could only be enacted and taxes could only be collected with the consent of the Diet, but most Diets were dominated by the monarch's partisans, which secured the imposition of royal will. Age of elected princes History John Sigismund only renounced the title of king of Hungary in the Treaty of Speyer in 1570. Thereafter he was styled prince of Transylvania, but his successors' right to use the new title was acknowledged by the Habsburg rulers of Royal Hungary only in 1595, during the reign of Sigismund Báthory. In that year, Báthory joined the anti-Ottoman Holy League of Pope Clement VIII. The Diets Composition The Diet was unicameral, with both appointed and elected members. Most Diets were attended by 130-150 persons. The noblemen (the "Hungarian nation") dominated the Diets, but the Székelys' military power and the Saxons' wealth secured the effective protection of their interests. The majority of the members of the Diets adhered to the Reformed Church in the 17th century. The Saxons represented the Evangelical Church, but the Catholic and Unitarian denominations were in practice reduced to background. Royal counselors, judges of the royal court of justice and other high-ranking royal officials were ex officio members of the Diet. Available data show that the bishops of the Reformed and Evangelical Churches also had seats at the Diets, according to historian Zsolt Trócsányi. The bishops of the Orthodox Romanians were certainly notified when the Diet was announced, but their regular presence is not documented. The presence of Catholic prelates is uncertain. János Bethlen recorded that the vicar of the Catholic Diocese of Transylvania was deliberately ignored in 1666, because the Catholic priests had denied to pay taxes. The princes were entitled to invite individuals to attend the Diet. The number of these "regalists" was not regulated, but more than twenty noblemen received a personal invitation from the monarch before each Diet. The number of regalists increased: more than 80 noblemen were personally invited to the Diet in 1686. Most regalists were members of the wealthiest noble families. Székely leaders were also personally invited, although the Székely community opposed this practice. According to János Bethlen's notes, the widows of former regalists were customarily also requested to send representatives to the Diets. The counties, Saxon and Székely seats and about twenty towns had the right to send delegates