The Gauls mixed with the Romans. That can be attributed to many things, but th Romans were not very kind to the celts culture and persecuted it, both with civil powers as well as military power.
In any event they became Gallo-Romans, and they gave a lot of men to the later empire days when it seemed there were invasions into heir lands on a daily basis. Various germanic tribes settled in their lands either for a while or more permanently. Visigoths came first and took the entire southern France. They stayed while more of them took over in Spain. They eventually got overthrown by others. Ostrogoths held parts of eastern France, they too stayed put but got conquered. Vandals 'passed by' but left enough people so that the area got a new influx of blood. Meanwhile in the north the Franks took over and eventually took over the south as well. They created the current state of France as well as their language by adopting the local language (with certain temrs still being in Frankish) and culture but held on to their own law and social structure.
Brittany as the name implies is a bit of area settled by peoples from Brittania. It seems the Saxons kicked the celts out so hard that some of them said "screw it all I'm going over here". And so it happened that celtic culture and language survived in Brittany.
Germania was never a single unity. Most likely the many tribes didn't consider each other similar, bur rather saw the others as they would see Rome or Greece, another player on the field.
What happened was that the Vandals, that came from the interior of Germania marched out, the rest is history. The Teutons were also Germanians. So were the Saxons (though they came from the north, where the province is in both MTW and RTW) just to th north of the Saxons were the Angles, they lived at the inner shore of the southern part of the Jutland peninsula. The Goths on the other hand seems to have come from the Scandinavian peninsula (Götaland in Sweden seems to be a good candidate for the homelands), it is even mentioned in their own history, fom there they spreat out, to Gotland and Poland, from there down to the Black Sea. Then came the Huns and they marched into Raman territory. The result was an Ostrogoth state in Italy and a Visigothic state in southern France and Spain.
The Spanish got subjugated by Rome... And it wasn't until the Vandals and Visigoths crossed through that a foreign army entered again. By then the locals had long been romans. Most of the local iberian, celtiberian and celtic cultures were dead, all but the basques it seems (don't know about the catalans). Well the Visigoths stayed and created their own kingdom that lasted until the arabs invaded in 711.
The Scythians are an enigma. Little is known about them or what happened to them, but everything seems to indicate that they unlike every other group migrated east. Possibly boosting the Pathians along the way so they could do their bid for power. A recent discovery has been made were the most impossible of odds have been overcome. The mitochondrial DNA from a female warriorgrave in Russia (a Scythian) has matched up perfectly with that of a blondehaired Mongol girl. Chances are that they got quite far east.
The Seleucids got gutted at Magnesia, but the romans only took part of their territory for the moment. The parthians took most of the rest, but lost it again to the romans. Seleucia was taken and converted into the Parthian capital of Ctsiphon.
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