One of the oldest works in the history of Iranian philology is "al-Mujam fi maayir ashar al-Ajam" by Shamsaddin Muhammad bin Qays ar-Razi, a prominent scholar who lived and worked in the late twelfth and first half of the thirteenth centuries. The point is that in this valuable work, which has a prominent place in the history of Iranian philology, eruz and rhyme studies, Shams Gays Razi also informs about the existence of his work on the Turkish language. Speaking about certain grammatical rules of Eruz and Persian, Shams Gays Razi compares Persian and Turkish, gives a few examples of Turkish words, and informs that he spoke about it in more details in his another work on the Turkish language. Researchers note that this work, written by Qays ar-Razi, is "Tibyanul lughat at-Turki al lisanul Gangli". According to the researchers, this work was dedicated to Jalaleddin Mangburni, who ruled in South Azerbaijan in 1223-1231, and was written between 1223-1226. It should be noted that the dictionary of Qays ar-Razi about Turkic languages was known to scholars since the Middle Ages. Thus, Ibn Muhanna referred to this work in his 13th century dictionary "Hilat al-insan wa halbat al-lisan", quoting various examples from it, and noted that this work was written by Qays al-Razi and dedicated to Jalaladdin Mangburniy. In our opinion, Qays al-Razi also informed about this work in his work "al-Mujam", he simply called it "Kitab der dictionary of Turks". It should be noted that based on this work, entitled in Azerbaijani translation "Explanatory Dictionary of the Turkish language to the Gangli language", we may confidently state that Qays ar-Razi knew the Azerbaijani language, the Gangli language, as well as several branches of the Turkic languages and was of Turkish origin.
Qays ar-Razi, Iranian philology, al-Mujam, Tibyanul lughat, eruz.