The Old East Slavic name of the town was Мѣньскъ (i.e. Měnsk < Early Proto-Slavic or Late Indo-European Mēnĭskŭ), derived from a river name Měn. The resulting[clarification needed] form of the name, Minsk (spelled either Минскъ or Мѣнскъ), was taken over both in Russian (modern spelling: Минск) and Polish (Mińsk), and under the influence of Russian this form also became official in Belarusian. The direct continuation of the name in Belarusian is Miensk, which some Belarusian-speakers continue to use as their preferred name for the city. When Belarus was under Polish rule, the names Mińsk Litewski ("Minsk of Lithuania") and Mińsk Białoruski ("Minsk of Belarus") were used to differentiate this place name from Mińsk Mazowiecki 'Minsk in Masovia'. In modern Polish, Mińsk without an attribute usually refers to the city in Belarus, which is about 50 times bigger than Mińsk Mazowiecki; (cf. Brest-Litovsk and Brześć Kujawski for a similar case).