It is believed that the barbarian invasions destroyed a huge part of the ancient inheritance. Goths, Avars and Slavs passed through this location. Slavs came in 6th and 7th centuries, and inhabited the middle part of Bosna river stream – where Zenica Field is located, site of some of the most important historic events of medieval Bosnia; these Slavs formed tribal communities and were organized into a tribal ruling unit called a 'župa' (parish). After their invasions, almost one century was needed for first Slav countries to form.