4th Century BC

400 BC - 100 BC During this period in time the Celts / Celtoi / Keltoi were to stand out in history, due to their particular Cultural way of life, their political organisation, and their appearance, and they were to be among the 4 great Peoples of the then known World, which also included the Scythians, the Persians, and the Libyans and from now on the Celts were to become dominant from Spain to Turkey and were to also besiege Rome and Greece and become the overlords of the Iberians in the north and the west of Spain where the 2 cultures were to combine to become known as the Celtiberians.

391 BC The Romans betrayed the Celts / Keltoi during the siege on Clusium, and the Celts under Brennus then marched on Rome without stopping anywhere along the way, and defeated those Romans who were still left in charge there in a single battle, and they stayed there for a year and demanded a great fine for the original Roman treachery at Clusium, and then left Rome with a Peace Treaty in place.

387 BC On the Continent the Celts who went into battle naked, because of the terror they inspired in the opposition along with their War - Cry were in control of Rome and because of this began to take up Latin as their other language, just as the Teutonic Scandinavian Goths were to make their first appearance also into recorded history. 

369 BC - 368 BC During this period in time many Celts also journeyed to the south - east, to serve as mercenaries in the Peloponnese, but even prior to this there had already been considerable Celtic migration into the Balkans, and there were also Celtic mercenaries from Gaul (France and part of Spain) in the army of Syracuse. At this time also the Celts who were still allied with the Greeks against the Persians and the Phoenicians, overrun Pannonia securing it from the Illyrians. The Celts in Gaul were the Aedui, Lexovii, Lemovises, Santones, Remi, and the Treveri who abolished their Kingships and instead the aristocratic warrior nobles elected a Vergobret / magistrate as they had the overall power through their hereditary aristocratic ancestors.

335 BC Alexander the Great, while in Bulgaria, received a deputation of Celts from the Lower Danube who were from the Adriatic. 

334 BC Alexander the Great this year made an alliance with the Celts, which kept his particular region safe during his expedition into Asia.

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