After settling, the Slavs repopulated some of the abandoned settlements from the Late Antiquity. Apart from previously mentioned early settlements, there are also remains in the habitats of Breza and Panik, near Bileća, both in modern Bosnia and Herzegovina, with the latter being in Travunija at the time.Serbian pottery from the 8th-9th century was discovered in old Roman/Byzantine habitats, which Slavs reworked using wood and stone, in the dry stone building method. Apart from the ceramics (Mogorjelo, Gornji Vrbljani, Ston), in some larger settlements, the Slavic necropolises were discovered, like in Makljenovac. This was one of the former forts, repopulated by the Slavs, and they were mostly located at the border of the Pannonian Plain, which became the border zone with the Avars after Slavs split from them. Re-population of the forts in the eastern part of the Serbian settled areas came later, from the mid-9th century (Ras, Vrsenice (near Sjenica), Gradište (Kraljevo), Gradina (Jelica mountain), etc., which was probably a consequence of the approaching threat from the Bulgarian attacks.