Armeno-Tats (Armenian: հայ-թաթեր – hay-tater) are a distinct group of Christian Tat-speaking Armenians that historically populated eastern parts of the South Caucasus, in what constitutes the modern-day Republic of Azerbaijan. Most scholars researching the Tat language, such as Boris Miller and Igrar Aliyev, agree that Armeno-Tats are ethnic Armenians who underwent a language shift and adopted Tat as their first language. This is explained on one hand by the self-identification of Armeno-Tats who stated during Miller's research that they consider themselves Armenian as well as by some linguistic features of their dialect. The Armeno-Tats formerly lived in Madrasa and Kilvar in Azerbaijan, but have almost entirely moved to Armenia and Russia.