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400 b.C.
400 BC is earlier than 220 BC
From around 750 BC to 12 BC, the Celts were the most powerful people in central and northern Europe. The Celts were in Britain since well before these dates
It is not known. Your question is extremely broad because there were many Celtic groups and the Celts were originally the biggest ethnic grouping in Western Europe. The Romans fought against many of them. They were attacked many times by the Gauls of northern Italy, who were, Celts and then fought them and conquered them in the 3rd century BC. They fought the Gauls of Gallia, who were also Celts, in the Gallic Wars (59-50 BC) when Julius Caesar conquered Gaul and in subsequent Gallic rebellions. Julius Caesar also carried out two expeditions in the southeast of England, which was inhabited by Celts. The Romans fought against the Celtiberians, the Celts of Spain, in the 2nd century BC. They fought against and conquered Noricum (most of Austria and Slovenia) which was inhabited by Celts, in 16 BC. They conquered southern England in 46 AD, Wales between 48 and 79 AD and northern England in 78 AD, all of which were inhabited by Celts. They pushed into Scotland a number of times, but withdrew and the Picts (Celts) of Scotland raided Roman Britain for centuries. As you can see from the above, it would be very difficult to estimate the number of Romans who died in many centuries of fights against Celtic groups.
55 bc-54bc
They tried in 1588 but failed.
no its false 400 bc comes before 500bc and 500bc comes after 400bc
Julius Caesar led the Roman conquest of the Celts in Gaul around 55 BC. The main Celtic tribe he defeated was the Helvetii, who were attempting to migrate through Gaul.
400 BC was 2416 years before AD 2017.
No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.No emperor ruled Rome in 400 BC. In that year Rome was a republic, not a principate.
400 BC
The Celts lived all over Europe: but in the successive waves of invasions - the Romans, and after the fall of Rome a whole series of barbarians - they were driven further and further West, until the remained clinging to the edge of Europe in what is known as the Celtic fringe: Scotland, Ireland, Wales, Cornwall, Brittany. The Celts lived in central Europe: northern France, part of Holland, Belgium, England, and parts of Switzerland. These lands had long been settled by the warlike Celts. Soon after 500 BC, the Celts wandered east and west in search of fertile farm land. Around 390 BC, the Celts even invaded Rome and sacked the city. It took two hundred years for the Romans to drive the Celts from Italy.