 Complete the following phrase:  Dardania is named after the Dardani, a tribe that lived in the region and formed the Kingdom of Dardania in the 4th century BC. The eastern parts of the region were at the Thraco-Illyrian contact zone. In archaeological research, Illyrian names are predomit in western Dardania present-day Kosovo, while Thracian names are mostly found in eastern Dardania present-day south-eastern Serbia. Thracian names are absent in western Dardania; some Illyrian names appear in the eastern parts. The correspondence of Illyrian names - including those of the ruling elite - in Dardania with those of the southern Illyrians suggests a thracianization of parts of Dardania. 