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This is a reboot of my previous TL 'Roman Gallia in middle-ages'; but I want discuss it before.

After doing some more searches, I want to discuss some points.

I was and I'm still convinced that the loss of Aquitaine to the Visigoths prevented any Roman successor state to last. The battle of Deols seems then an obvious POD.
Previously, I worked on the idea that the Brittons of the Riothamus were to join the forces of Count Paul and King Childeric.
It is logical to think so.
However, when I read the History of the Franks (Grégoire de Tours), the Getica (Jordanes), I've not found any explicit statement of an alliance between Riothamus and the Romans of Soissons.

When I read about the battle of Cahoraise (today Cahraix-Plouger), a battle of the arthurian legend which took place in 474, I had an idea. At Cahoraise, the army that Arthur fought was a coalition of Romans, Germans (likely Franks) and people from a country called 'Desert Land' (a continental country, maybe Alans or less likely Visigoths).
That the Romans and Franks lead a joint attack on the Brittons make me thinking that Riothamus (likely Ambrosius Aurelianus) was in fact come to help of Roman Auvergne.
In fact, Jordanes tells us that Anthemius called the Brittons for help to defend Gaul; I doubt he would have also called on the Romans of Soissons which had seceded. In 461, Aegidius seceded (or rebelled if you prefer) when he was made aware about the execution of his friend and Emperor Majorian; even after the death of Aegidius, I doubt that Soissons would have improved relations with Rome while Ricimer was still there.
In the 460s-470s, Auvergne seems to be dominated by the Aviti, family of the former Emperor Avitus whose a son named Ecdicius who is mentioned as defending Auvergne while Julius Nepos had abandoned it to the Visigoths. Sidonius Apollinaris was also linked to this family and played an important role in Auvergne until his death; the manner he writes to Riothamus suggests that there were amical relations between them.
What's more, I doubt about good relations between the Riothamus and Soissons: Aegidius was a former lieutnant of the same Aetius (as was surely Paul) who launched the Alans against Armorica in the 440s.
When Gregory of Tours mentionned Paul and Childeric, just after relating the fate of the Brittons at Deols, he tells that they were to attack the Saxons of Eadwacer.
Of course, in Getica, Jordanes says that Riothamus was defeated before the Romans could join him. Several people think that these Romans were the forces of Count Paul mentioned by Gregory of Tours, but I think that they were the forces of Anthemiolus mentioned in the Chronica Gallica of 511.
An other argument: the first thing that Gregory of Tours mentions after the battle of Deols and the war between Roman-Franks and the Saxons was that the Visigoths were expanding into Auvergne.

On the battle itself, we have no detailed accounts excepted the causes and the outcome.
Bourges, where Riothamus was before Deols, is rather close to Auvergne and the Burgundian realm (that Jordanes says to be allied to the Romans).
I guess that the Brittons were to wait Anthemiolus which was to come from Burgundian Gaul, as Narbonne was in Visigothic hands for some years and that a junction more to south would have exposed them too early to the Visigoths.

On the treason of Arvandus, I wouldn't be surprised if he was in fact victim of a plot. The domain of Soissons was ruled by the Syagrii while Auvergne was dominated by the Avitii; Sidonius Apollinaris defended Arvandus, a great friend of his, that make me thinking that Arvandus could have governed in favour of the Avitii and that the Syagrii would have wanted to get rid of him, as Tonantius Ferreolus, a relative of the Syagrii, was the one who accused Arvandus of treason. What's more, we could even imagine that the true treason came from the Syagrii who could have wanted to prevent that Euric be removed, making Soissons surrounded by forces loyal to Rome.
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