Starting in rural areas and small market towns, the 19th century was the golden age of Welsh nonconformity. Some small settlements, such as
Carmel,
Nebo and Sardis, grew around a chapel or meeting house and were named after it. Some of these settlements, such as
Bethesda, Gwynedd, became large settlements. In the era of rapid industrialisation after the
Napoleonic Wars, nonconformity became firmly established in the new industrial settlements of
South Wales as migrants from the rural counties brought their religious affiliations with them. In places such as
Merthyr Tydfil,
Aberdare,
Llanelli and
Neath, Nonconformity grew alongside industry and by the 1880s these towns were regarded as "citadels of dissent", with their ministers and
deacons having a powerful role among a new
middle class elite which dominated public life. The ministers also had considerable influence within working class networks which, in part, reflected their own social origins. The Religious Census of 1851 showed that 80% of those who attended a place of worship on Census Sunday in Wales were Nonconformists, even though the large proportion of the population, even in Wales, who were not recorded in the census, suggested that the influence of religion within society was far more tenuous than first appearances suggested. In 1859 there was another popular revival, which began in north
Cardiganshire and eventually affected most of Wales. It was primarily, however, a
Welsh language phenomenon, and its influence was, in the main, a transient one. Nevertheless, by the 1880s, Nonconformity was approaching its golden age. Chapel buildings were increasingly grandiose, in contrast to the austerity of the earlier meeting houses of the revivalist period. Professional architects were engaged to design elaborate structures, especially in larger towns such as
Aberystwyth,
Caernarfon,
Carmarthen and
Swansea, as well as in the developing townships of the industrial valleys. == Nonconformist denominations in Wales ==