 In antiquity, the territory of the present-day Republic of North Macedonia equated approximately to the kingdom of Paeonia, which lay immediately north of ancient Macedonia.The western and central parts of modern Greek region of Macedonia approximately corresponds to that of ancient Macedonia, while the Bulgarian part and the eastern part of the Greek area, are mostly in Ancient Thrace.After the Romans conquered Greece in 168 BC they established a large administrative district in northern Greece which added Paeonia and eastern parts of Ancient Thrace to other territories outside the original ancient Macedonia.