Acichorius was one of the leaders of the Gauls, who invaded Thrace

Thrace

Thrace is a historical and geographic area in southeast Europe. As a geographical concept, Thrace designates a region bounded by the Balkan Mountains on the north, Rhodope Mountains and the Aegean Sea on the south, and by the Black Sea and the Sea of Marmara on the east...

 and Macedon

Macedon

Macedonia or Macedon was an ancient kingdom, centered in the northeastern part of the Greek peninsula, bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south....

ia in 280 BC

280 BC

Year 280 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Laevinus and Coruncanius...

. He and Brennus

Brennus (3rd century BC)

Brennus was one of the leaders of the army of Gallic invasion of the Balkans, defeated the assembled Greeks at Thermopylae, and is popularly reputed to have sacked and looted Delphi, although the ancient sources do not support this.In 280 BC a great army, comprising about 85,000 warriors, coming...

 commanded the division that marched into Paionia

Paionia

In ancient geography, Paeonia or Paionia was the land of the Paeonians . The exact original boundaries of Paeonia, like the early history of its inhabitants, are very obscure, but it is believed that they lay in the region of Thrace...

. In the following year, 279 BC

279 BC

Year 279 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Saverrius and Mus...

, he accompanied Brennus in his invasion of Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

. Some writers suppose that Brennus and Acichorius are the same persons, the former being only a title and the latter the real name.