Sarkel - Credit: Wikimedia Commons
Sarkel (or Šarkel, literally "white house" in the Khazar languageD.M. Dunlop, The History of the Jewish Khazars, Princeton University Press (1954).The first part Sar is cognate with Chuvash šur 'white', while kel/kil reflects a now lost West Middle Iranian cognate of Sanskrit grḥ a ‘house’, Russian gorod ‘town’, Gothic garths ‘house’. Marcel Erdal, Khazar Language, in Peter B. Golden et al. (eds.). The World of the Khazars. New Perspectives. BRILL pp. 75-108,pp.85-86; Károly Cseglédy, "Šarkel: An Ancient Turkish Word for 'House'" in D.Sinor, ed., Aspects of Altaic Culture (Uralic and Altaic studies no. 23) (Bloomington and the Hague, 1963), pp. 23-31. ) was a large limestone-and-brick fortress in what is now Rostov Oblast of Russia, on the left bank of the lower Don River. Read more on Wikipedia
Source: en.wikipedia.org