 All these are characterised by strict grid street plans, which were filled in with single-storey vernacular-style wooden buildings.Even stricter building and planning regulations came with the appointment of Per Brahe as Governor-General of Finland in 1637 (a position he held intermittently until 1653).Among the new towns founded by Brahe were Hämeenlinna, Savonlinna, Kajaani, Raahe and Kristinestad as well as shifting the position of Helsinki.