Which region did caesar annex to the roman state?
Gaul
Brennus was the cheif king of the Gauls when they opposed Rome
The Franks occupied parts of the western part of the Roman Empire. They did not actually occupy Rome. They had been allowed to settle in the part of the empire which is now Holland south of the River Rhine and Flanders in Belgium as Roman allies. As the western part of the Roman Empire was disintegrating, they expanded into central Gaul (486), took over the area of southern Germany Switzerland and Austria which had been occupied by the Alemanni (502), pushed the Visigoths out of Aquitania (south-western France, 507 and 531) and conquered the lands of the Burgundians in eastern Gaul (533), thus taking over the whole of Gaul (France).
Julius Caesar.
The Visigoths did. Later they occupied Spain and Portugal and were pushed out of southwestern Gaul by the Franks,
There was not a single barbarian who helped to weaken Rome. There were several. Attila of the Huns raided the eastern part of the Roman Empire three times and tried to invade Gaul and then Italy. Alaric I of the Visigoths besieged the city of Rome three times and on the third occasion he sacked it. Later Rome was also sacked by Ginseric of the Vandals. There were also invasions by several Germanic peoples, the takeover of Spain by the Visigoths, the expansion form the northern areas of Gaul into the rest of Gaul by the Franks (which started with king Clovis) and the takeover of Britain by the Angles, Saxon, Jutes and Frisians.
Rome
Gaul wasn't a powerful empire.
From ancient Rome's early days and moving forward into the empire's expansion, one area seems to me to have been problematic for ancient Rome. In my opinion, Gaul (modern day France and the lowlands )was a problem. Yes were times when Gaul was the least of the empire's problems. The size of Gaul, however, and the richness of the land made Gaul not the easiest of areas for Rome to control. Other "uncivilized" nations liked being in Gaul, whether they were invited or not. Gaul had a large significant sea coast and its eastern borders were dominated at times by Germanic tribes. Because of Gaul's value to Rome, Gaul needed constant attention.
Which region did caesar annex to the roman state?
Gaul
The land where France would be was once called Gaul, around the time of Rome.
Brennus was the cheif king of the Gauls when they opposed Rome
The Franks occupied parts of the western part of the Roman Empire. They did not actually occupy Rome. They had been allowed to settle in the part of the empire which is now Holland south of the River Rhine and Flanders in Belgium as Roman allies. As the western part of the Roman Empire was disintegrating, they expanded into central Gaul (486), took over the area of southern Germany Switzerland and Austria which had been occupied by the Alemanni (502), pushed the Visigoths out of Aquitania (south-western France, 507 and 531) and conquered the lands of the Burgundians in eastern Gaul (533), thus taking over the whole of Gaul (France).
Gaul
Gaul