Ипатьевская летопись
The old city defense is one of the oldest settlements in the East. First mentioned in 1147 in "The Tale of Bygone Years" from the Hypatian Codex, and belonged to the Chernigov principality, but soon was destroyed along with the cities Vyvolozh, White Tower, Unizh (now the village Syvolozh, Białowieża and the city of Nizhyn) during the feudal strife between the princes Olegovichy Chernihiv and Mstislavovich Kyiv.