This article deals with the history of the research of the influence of Nizami Ganjavi's "Seven Beauties" poem on the "Turandot" opera composed by famous Italian composer Ciakomo Puccini. The author of this article comes to the polemic with the famous scientist, professor of New York University P. Chelkovsky about the connection of the Iranian-Persian culture with the opera of "Turandot". Prof. P. Chelkovsky affirmed that the heroine of the opera Turandot was the Turkish origin. In support his version the researcher addresses to the original text of Nizami's "Seven Beauties" poem, where in the red palace a Slavic girl tells Bahram shah the story about a Turkish girl living in Russia. The author of the article proves that both outward and inward traits of the girl described by the Slavic beauty resembles to the image of a Turkish girl. That’s why the Italian writer Carlo Gozzi gave to the principal heroine the name of Turandot or Turan girl.