The concept of a Ural-Altaic ethnic and language family goes back to the linguistic theories of Gottfried Wilhelm Leibniz; in his opinion there was no better method for specifying the relationship and origin of the various peoples of the Earth, than the comparison of their languages. In his "Brevis designatio meditationum de originibus gentium ductis potissimum ex indicio linguarum", written in 1710, he originates every human language from one common ancestor language. Over time, this ancestor language split into two families: the Japhetic and the Aramaic. The Japhetic family split even further, into Scythian and Celtic branches. The members of the Scythian family were: the Greek language, the family of Sarmato-Slavic languages (Russian, Polish, Czech, Dalmatian, Bulgar, Slovene, Avar and Khazar), the family of Turkic languages (Turkish, Cuman, Kalmyk and Mongolian), the family of Finnic languages (Finnish, Saami, Hungarian, Estonian, Liv and Samoyed). Although his theory and grouping were far from perfect, it had a tremendous effect on the development of linguistic research, especially in German speaking countries.