Teschener Mundarten
Cieszyn Silesia or the Duchy of Teschen ( and ) was a small area in south-eastern Silesia. The Duchy was part of the historic Czech lands of Bohemian Crown - Crown of Saint Wenceslaus (born Václav). Latin, German, Czech, Moravian and finally Polish served as an official language of the region, however throughout the ages many historical sources suggested the local population remained mostly Polish-speaking in the form of the Cieszyn Silesian dialect, regardless of the official language.