Kevin Alan Brook: „The great capital city of modern Ukraine, Kiev, was founded by Khazars or Hungarians. Kiev is a Turkic place name (Küi = riverbank + ev = settlement). A community of Jewish Khazars lived in Kiev. Other towns of the Khazars, many of which also had important Jewish communities, included Kerch (Bospor), Feodosia, Tamatarkha (Tmutorokan), Chufut-Kale, Sudak, and Sarkel. The local governor of Samandar was Jewish, and it may be assumed that many of the governors of these other localities were also Jewish. A major brick fortress was built in 834 in Sarkel, along the Don River. It was a cooperative Byzantine–Khazar venture, and Petronas Kamateros, a Greek, served as chief engineer during the construction.”