Dacians, who were considered to be the ancestors of the Romanians), were believed to have lived east of the Tisza, while Illyrians (Pannonians) lived west of the Danube. Celts came from the west around 450 B.C.E., and spread over the whole of present-day Hungary in the Late Iron Age, while the Pannonian (in the southwest) and Thracian presence seems to have continued. In the first half of the first century B.C.E., the Dacian king Burebista extended his rule over the Pannonian Plain, as far as present-day eastern Austria, and battled the Boii in present-day southwestern Slovakia around 60 B.C.E.