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In Hungary the situation is different, due mostly to the semi-independent Transylvanian Principality (1570-1711) and the Ottoman occupation of the central parts of the Kingdom of Hungary (1541-1699). In the principality, the elected princes were either converts to Calvinism, as in the case of János Zsigmond, the first prince of Transylvania (1565-1571), or were already born as Calvinists and were therefore promoters of freedom of religion. In the case of the Ottoman-held territories, Catholic aristocratic families fled north or west into so-called Royal Hungary, and therefore their former serfs could follow their own religious inclinations. - hungarianspectrum.org