The Reformed Religion was brought into Transylvania in 1550 and
swiftly adopted by a part of the Hungarian nobility and the urban patriciate.
In the inter-war period, after the Greater Union of all the Romanian
Provinces on December 1, 1918 the Reformed Church had two Episcopates:
the Episcopate of Transylvania and ‘Piatra Craiului’ Episcopate. Major
changes in the numerical evolution and territorial distribution of the
Reformed Transylvanian populations were the following: a) a decrease from
497,861 faithful in 1930 to 476,481 in 2002 due to negative birth-rates after
1990 – which is not specific to this confessional group alone, but to most
religious communities, and emigration to Central and West-European
countries; b) changes in the distribution of the Calvinist believers by habitat,
from 21 % in the town area of 1930 to some 53 % in the urban of 2002.