On the Caucasian Persian (Tat) Lexical Substratum in the Baku Dialect of Azerbaijani. Preliminary Notes research-article Artyom Tonoyan Zeitschrift der Deutschen Morgenländischen Gesellschaft, Jahrgang 169 (2019), Ausgabe 2, Seite 367 - 378 Caucasian Persian, also known as the Tat or Caucasian Tat language, was dominant in various parts of historical Shirvan, in particular in the Absheron Peninsula, up to the middle of the 19th century. According to Berezin, who travelled along the east coast of the Caspian Sea during 1842–1849, there were only 6 villages in Baku Province, where people were speaking “Turkish”, i. e., the Azerbaijani language. Later on, the process of Turkicization resulted in the progressive spread of the Azerbaijani language and the nearly complete assimilation of Caucasian Persian in Absheron Peninsula, but some lexical traces of this Iranian language have been preserved in most of the dialects of Azerbaijani. This article is devoted to the examination of the Caucasian Persian lexical substratum in the Baku dialect of Azerbaijani. Some Caucasian Persian lexical units attested in the aforementioned dialect are investigated in this paper as a preliminary study.