It is assumed that Burnum originates from the year 33 BC, but it is more likely that it was established a few decades later. Several Roman legions were located there in succession, and the first one was Legio XX Valeria Victrix from the beginning of the Pannonian uprising ("Bellum Batonianum") in AD 6-9. The reason for its location was the need for the control of traffic around the Krka River. Building was initiated by the Roman governor for Dalmatia Publius Cornelius Dolabella and continued by the Emperor Claudius.