In linguistics, the Japhetic theory of Soviet linguist Nikolay Yakovlevich Marr (1864–1934) postulated that the Kartvelian languages of the Caucasus area are related to the Semitic languages of the Middle East. The theory gained favor among Soviet linguists for ideological reasons, as it was thought to represent "proletarian science" as opposed to "bourgeois science".
Marr adopted the term "Japhetic" from Japheth, the name of one of the sons of Noah, in order to characterise his theory that the Kartvelian languages of the Caucasus area were related to the Semitic languages of the Middle East (named after Shem, Japheth's brother). Marr postulated a common origin of Caucasian, Semitic-Hamitic, and Basque languages. This initial theory pre-dated the October Revolution (the reference is made in Pan Tadeusz written by Adam Mickiewicz in the 1800s). In 1917, Marr enthusiastically endorsed the revolution, and offered his services to the new Soviet regime. He was soon accepted as the country's leading linguist.
Under the Soviet government, Marr developed his theory to claim that Japhetic languages had existed across Europe before the advent of the Indo-European languages. They could still be recognised as a substratum over which the Indo-European languages had imposed themselves. Using this model, Marr attempted to apply the Marxist theory of class struggle to linguistics, arguing that these different strata of language corresponded to different social classes. He even claimed that the same social classes in widely different countries spoke versions of their own languages that were linguistically closer to one another than to the speech of other classes who supposedly spoke "the same" language. This aspect of Marr's thinking was an attempt to extend the Marxist theory of international class consciousness far beyond its original meaning, by trying to apply it to language. Marr also insisted that the notion that a people are united by common language was nothing more than false consciousness created by "bourgeois nationalism".