For instance, read what the dynasts were saying about the dynasty being "ancient", or look at what King Tvrtko I wrote in his letters, about the dynasty "having reigned Bosnia ever since Bosnia was founded"... We know Borić (of Berislavićs of Grabarje) was the first Viceroy of Bosnia and the ruler of the then newly founded Banate of Bosnia. Go to the Ban Borić article, I updated it. Please try not to be rude.