Celts in Transylvania arrived in northwestern Transylvania in around 400–350 BC as part of their great migration eastwards. When Celtic warriors first penetrated these territories, the group seem to have merged with the domestic population of early Dacians and assimilated many Hallstatt cultural traditions. The second half of the 4th century BC saw the Middle La Tène Celtic culture emerge in north-western and central Dacia, a development reflected especially in burials of the period. Celtic artifacts dating to this time have been discovered at Turdaş, Haţeg and Mediaş in modern-day Romania. By 1976, the number of Celtic sites found in Transylvania had reached
Transylvania Catholic, Lutheran, Reformed, and Unitarian branches. Other faiths also are present, including Jews and Muslims. Under the Habsburgs, Transylvania served as a place for "religious undesirables". People who arrived in Transylvania included those that did not conform to the Catholic Church and were sent here forcibly, as well as many religious refugees. Transylvania has a long history of religious tolerance. This has been ensured by its religious pluralism. Christianity is the largest religion in Transylvania. Transylvania has also been (and still is) a center for Christian denominations other than Eastern Orthodoxy, the form of Christianity that most Romanians follow. As