Macedonia Prima

Provincia Macedoniae Επαρχια Μακεδονιας
Province of the Roman Empire
← 146 BC–7th century
The province of Macedonia within the Roman Empire, c. 125
Capital		Thessalonica in Late Antiquity: Thessalonica (Macedonia Prima) and Stobi (Macedonia Salutaris)
Historical era		Antiquity
•	Established after the Fourth Macedonian War	146 BC
•	Balkan interior raided by Slavs	7th century
Today part of		Greece  Albania  Bulgaria  Republic of Macedonia

The Roman province of Macedonia (Latin: Provincia Macedoniae, Greek: Ἐπαρχία Μακεδονίας) was officially established in 146 BC, after the Roman general Quintus Caecilius Metellus defeated Andriscus of Macedon, the last self-styled King of the ancient kingdom of Macedonia in 148 BC, and after the four client republics (the "tetrarchy") established by Rome in the region were dissolved. The province incorporated ancient Macedonia, with the addition of Epirus, Thessaly, and parts of Illyria, Paeonia and Thrace. This created a much larger administrative area, to which the name of 'Macedonia' was still applied. The Dardanians, to the north of the Paeonians, were not included, because they had supported the Romans in their conquest of Macedonia.

After the reforms of Diocletian in the late 3rd century, Epirus Vetus was split off, and sometime in the 4th century, the province of Macedonia itself was divided into Macedonia Prima in the south and Macedonia Secunda or Salutaris in the north. These provinces were all subordinate to the Diocese of Macedonia, one of three dioceses comprising the praetorian prefecture of Illyricum. When the Prefecture was divided between the Western and Eastern Empires in 379, the Macedonian provinces were included in Eastern Illyricum. With the permanent division of the Empire in 395, Macedonia passed to the East, which would evolve into the Byzantine Empire.

...
Wikipedia