Dersim

Dersim (Kurdish: Dêrsîm, Zaza: Dêsim, Armenian: Դերսիմի) is a historical region in Armenian Highlands, today in Turkey. 
The region included all parts of Tunceli Province (Çemişgezek, Hozat, Pertek, Tunceli, Ovacık, Pülümür, Nazımiye, Pertek) Tercan, Kemah and Kemaliye in Erzincan Province, Keban in Elâzığ Province, Kiğı in Bingöl Province and Arapkir in Malatya Province.
Demographics.
Tunceli's (Dersim) language distribution is 69.5% Kurdish and Zazaki, 29.8% Turkish and 0.74% Armenian in 1927, also according to Savaş Sertel, Zazas are majority people and Zazaki were more common than Kurdish and. However, Ahmet Kerim Gültekin defined the region as predominantly Kurdish Alevi. Kurmanji Kurdish is the main dialect around Pertek, while Zaza is spoken in Hozat, Pülümür, Ovacık and Nazımiye. Both Kurmanji and Zaza is spoken in Tunceli town and Mazgirt. The Dimli (or Zaza) people of Dersim are the descendants of the Deylamites who migrated from the highlands of Gilan region of Iran in the 10th–12th century.
Etymology.
According to Nuri Dersimi, it is noteworthy that six centuries before Christ, Greek historians and geographers called the Dersim region Daranis, and in the Bisltun inscriptions of Dara, this region is called Zuza, and the term Zuza is similar to the word Zaza, which is the "Kurdish dialect" spoken in Dersim and its region. According to another thesis, estimated that the name Dersim (Der-sîm "silver gate" in Persian) was given to the region, which frequently changed hands between the Sassanids and Byzantium during the Byzantine period.