1. about the subject

Language monuments
Linguistic information is also of special importance in the study of history. Such information includes the names of tribes, clans, individuals and places, ancient words, texts, words that explain the interaction and connection of languages, and other materials. Language materials are also important in investigating problems, like ethnicity, migration processes, social relations, and so on.

Language materials also have a special place in the study of the history of Azerbaijan. The language monuments that are included in the scientific content and under study of Azerbaijan onomastics, toponymy, linguistic interaction of linguistics, etc. are noteworthy in this respect.

Proper nouns occupy an important place among the language monuments. Proper nouns allow us to trace the historical development from ancient times to modern times. Proper nouns are considered valuable because they contain information about ancient times. Well-known linguist Tofig Hajiyev wrote: “It is a language that keeps the history of the nation alive. As one of the many ancient languages, the ancient times of the Azerbaijani language are not confirmed in the texts. Therefore, every Azerbaijani word preserved in the writings of Front Asia and other ancient languages ​​of the same age is worth a book. Of course, in foreign sources, first of all, terminological units, such as ethnonyms, anthroponyms, toponyms are preserved ».
Ethnonyms, such as Caspi, Mu, Albanian, Cadus, Anariak, Enion, Silo were mentioned in the works by ancient authors in the Albanian territory, while - Albanian, Hun, Gargar, Lbin, Chilb, Dzhigt, Her, Maskut, Uti, Sharvan, Ijmak, Kangar and other ethnonyms were found in ancient Armenian and Georgian sources. Medieval sources are also rich in ethnonyms. Special attention was drawn on the explanation of most ethnonyms known to researchers. According to T. Hajiyev, the word Kadus consists of two parts - kad + us / z, due to the ancient consonant pairs (adak-azak-ayag, adug-azykh-ayi) in ancient Turkish language, the first element becomes “kat”. Thus, this ethnos (kadusi) includes two Oghuz tribes, as kaz and uz.
M. Seyidov attached special attention to the etymology of the Turkic tribes, as Gashgai, Sag, Arsag, Sirag-Shirag, Hun, Basil, Bulgar, Khazar, Varsag and others.
Names also contribute to the study of history. Historical events have become sources of most names of individuals.
Names of pre-Islamic and Islamic periods differ from each other. The names of people living in the pre-Islamic period are found in cuneiforms, in the works of ancient authors, in Orkhon-Yenisei monuments, epic "Kitabi-Dede Gorgud" and so on.
Names of places also have a special role in the study of history.
Ancient dictionaries also serve as an important historical source. M. Kashgari's "Divani-lughat-it turk" (XI century) is a proof of the foregoing.
Languages, like nations, interact with each other. This allows us to trace the history of one language to another. Words from languages, such as Arabic, Persian, Russian, etc. influenced and gained widespread use in the Azerbaijani language, and at the same time these languages borrowed some words from Azerbaijani Turkish.