The fairly late mid-10th century mention, because is not mentioned in older inscriptions and royal charters, indicates it was not preserved from the period of Avar Khaganate as was previously presumed in historiography. It rather indicates to the influence of the expansion of the Northern border by King Tomislav of Croatia, after the conquest of Slavonia by the Hungarians, making the position of ban similar to that of a margrave defending a frontier region. That the ban was significant almost as a king is seen in a 1042 charter in which a certain ban "S", most probably Stjepan Praska, founded by himself a monastery of "Chrysogoni Jaderæ" granting it land, wealth, cattle, peasants, and that he attained the Byzantine imperial title of protospatharios. This imperial title, somehow related to that of a ban, was given to provincial governors and foreign rulers, and most probably was used to highlight the connection between the Croatian and Byzantine royal court.