1911 Encyclopædia Britannica, Volume 18… (1911)
“ After the conquest of the Kazan Empire by Russia, part of them migrated north-eastwards to the basins of the Kama and Byelaya, and thus the Meshchers divided into two branches. The western branch became russified, so that the Meshcheryaks of the governments of Penza, Saratov, Ryazan and Vladimir have adopted the customs, language and religion of the conquering race ”
