Ипатьевская летопись
The city's year of establishment and source of name is uncertain. It is mentioned by Hypatian Codex as earlier as 1032 which is assumed as the year of establishment. In official documents it is mentioned as earlier as 1195 when Bohuslavl was handed over by the Grand Prince of Kyiv Rurik II to the Grand Prince of Vladimir-Suzdal Vsevolod III who preceded him on Kyivan throne several years earlier.