Dovnar-Zapolsky notes that "the 1800s–1810s had seen the unprecedented prosperity of the Polish culture and language in the former Great Duchy of Lithuania lands" and "this era has seen the effective completion of the Polonization of the smallest nobility, with further reduction of the areal of use of the contemporary Belarusian language. also noting that the Polonization trend had been complemented with the (covert) anti-Russian and anti-Eastern Orthodox trends. The results of these trends are best reflected in the ethnic censuses in previously non-Polish territories.