Cieszyn Silesian dialect
The earliest linguistically scientific modern subdivision of the Silesian dialects in Poland dates to Stanisław Bąk (1974), inspired by early 19th century work by Jerzy Samuel Bandtkie. He recognised the Cieszyn Silesian dialect as a distinct subgroup of Silesian, followed by other linguists (Zaręba, Wyderka), who occasionally omitted the Czech part of the region from the territory of the Silesian dialects.