The Triballi were an ancient people who lived in northern Bulgaria in the region of Roman Oescus up to southeastern Serbia, possibly near the territory of the Morava Valley in the late Iron Age. The Triballi lived between Thracians to the east, Illyrians the west and Celts to the north and were influenced by them. As such in contemporary sources, they are variably described as an independent, Thracian, Illyrian or Celtic tribe. Strabo considered the Triballi as a Thracian people. Most ancient sources considered the Triballi as Thracians, while some few regarded them as Illyrians.