Nikolai Trubetzkoy, the Russian linguist, was a member of the Kazan School.
Kazan School was an influential group of linguists in Kazan. 
 The linguistic circle included the Polish linguist Jan Baudouin de Courtenay and his student Nikolai Trubetzkoy. 
Prince Nikolai Sergeyevich Trubetzkoy (also Troubetskoy; Russian:   ; Moscow, April 16, 1890  Vienna, June 25, 1938) was a Russian linguist and historian whose teachings formed a nucleus of the Prague School of structural linguistics. 
