It's older than castles and occurs in some of the oldest scandinavian stone carvings. In the middle ages it was associated with John the baptist in Scandinavian

It's older than castles and occurs in some of the oldest scandinavian stone carvings. In the middle ages it was associated with John the baptist in Scandinavian christianity. The use discussed here is established from the 1950s onwards, first suggested by a local history society in Finland.