Tvrtko je imao i formalne uslove da to učini. Nakon smrti cara Uroša, potkraj 1371. godine, on se javio kao pretendent za upražnjenu srpsku krunu imajući i direktno srodstvo preko bake Jelisavete sa dotadašnjom vladarskom lozom Nemanjićima. po babinoj liniji ----------------------------------------------- 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