History of Finland
The history of Finland begins around 9,000 BC during the end of the last glacial period. Stone Age cultures were Kunda, Comb Ceramic, Corded Ware, Kiukainen, and Pöljä cultures. The Finnish Bronze Age started in approximately 1,500 BC and the Iron Age started in 500 BC and lasted until 1,300 AD. Finnish Iron Age cultures can be separated into Finnish proper, Tavastian, and Karelian cultures. The earliest written sources mentioning Finland start to appear from the 12th century onwards when the Catholic Church started to gain a foothold in Southwest Finland.
Finns
Christianity was introduced to Finns and Karelians from the east, in the form of Eastern Orthodoxy from the Medieval times onwards. However, Swedish kings conquered western parts of Finland in the late 13th century, imposing Roman Catholicism. Reformation in Sweden had the important effect that bishop Mikael Agricola, a student of Martin Luther, introduced written Finnish, and literacy became common during the 18th century. When Finland became independent, it was overwhelmingly Lutheran Protestant. A small number of Eastern Orthodox Finns were also included, thus the Finnish government recognized both religions as "national religions". In 2017 70.9% of the population of Finland belonged to the Evangelical Lutheran Church of Finland, 1.1% to the Finnish Orthodox Church, 1.6% to other religious groups and 26.3% had no religious affiliation (see irreligion in Finland). Whereas, in Russian Ingria, there were both Lutheran and Orthodox Finns; the former were identified as Ingrian Finns while the latter were considered Izhorans or Karelians.