Prominent in the discussions are certain brooch forms, seen to derive from Illyrian prototypes. However, a recent analysis revealed that whilst broad analogies are indeed evident to Iron Age Illyrian forms, the inspiration behind Komani fibulae is more closely linked to Late Roman fibulae, particularly those from Balkan forts in the present-day Serbia and northwestern Bulgaria. This "might" suggest that after the general collapse of the Roman "limes" in the early 7th century, some late Roman population withdrew to Epirus. However, assemblages also have many "barbarian" artefacts, such as Slavic bow-fibulae, Avar-styled belt mounts and Carolingian glass vessels. By contrast, beyond the immediate Adriatic littoral, most of the west Balkans (including Dardania) appears to have been depopulated after the early 7th century from almost a century. Another aspect of discontinuity is the design of the tombs: pits lined by limestone rocks, a construction used in the region since the Iron Age period. However the tombs in the 7th century, such burials are in a Christian context (placed next to churches) rather than reversion to a pagan Illyrian past.