The Charter of Ban Kulin is the symbolic birth certificate of Bosnia's statehood, as it is the first written document that refers to Bosnia's borders (between the rivers of Drina, Sava and Una) and the elements of the Bosnian state - the ruler, throne and political organization. It is written in Bosnian Cyrillic and it also referred to the people of Bosnia - Bosnianins. The Charter was a trade agreement between Bosnia and the Republic of Dubrovnik.