Hence the famous description of Bosnia by written by Manuel Comnenus’ secretary, the chronicler Kinnamos, who was writing probably in the 1180s: ‘Bosnia does not obey the grand župan of the Serbs; it is a neighboring people with its own customs and government.’ [22] Kinnamos also noted that Bosnia was separated from Serbia by the river Drina.
http://www.bosniafacts.info/web/Bosnia_to_1180.php