his Fehéregyháza castle. Stephen (István) Haller I (1591–1657) was a confidant of the anti-Habsburg Protestant princes Gabriel Bethlen and George I Rákóczi in the turmoil of the Thirty Years' War. He also became burgrave in Küküllő (Kokelburg), general and president of parliament. He was involved in the initiation of Bethlen's marriage to Catherine of Brandenburg. In 1610 he had a new castle built in Kerelőszentpál. He campaigned for tolerance towards Catholics. He left three sons: Paul II, Gábor II and Johann II. Gábor Haller II (1614–1662), a son of Stephen Haller I, was a page at the court of Princess Catherine, then studied at the Viadrina University in Frankfurt/Oder from 1630, converted to the Reformed church and went to study at the University of Leiden, a stronghold of Calvinism. Under the Calvinist princes George I Rákóczi and his son George II, he made a career in the judiciary and in the military. After their defeat, he was taken into Turkish captivity. Only released in 1660, Prince Michael I Apafi, who had been installed by the Turks, regarded him as a competitor; in 1663 Gábor Haller was executed by the Turks. His diary is an important source of that time. János Haller I (1626–1697), another son of Stephen I, was an important figure. During Apafi's reign, he was part of the opposition and spent a long time in captivity. There he studied literature and translated books into Hungarian, and also wrote a biography on Alexander the Great. After his release in 1682, he was sent to the Habsburg court in Vienna, and reached an agreement with the emperor, which became known as Tractatus Hallerianus. In 1691 he was elected treasurer of Transylvania. Stephen (István) Haller II (1657–1710), eldest son of János I, became chairman of the government council of Transsilvania in 1692 under the new Habsburg rule, remaining a Hungarian national, while the two other members were Transylvanian Saxons. He remained governor until his death in 1710. He was instrumental in the reorganization of the Roman Catholic Church in Transylvania. He was raised to baronial rank in 1699 and, posthumously, created a count in 1713, a title which passed to his sons Gábor, János II and László Haller. Janos II (1692-1756) also became governor in 1734 and remained so for 22 years until his death; during his tenure there were disputes with the Reformed. Franz Haller, count Haller de Hallerkeö (1796–1875)