AHC: Hyper-Soissons

You probably need to have ?Clovis? not to be smart enough to adopt Catholicism. If only minor tribes do, and *Soissons can rally them to a defence of Catholicism/Orthodoxy against Arianism, THEN you might get such a mini-empire to survive and then grow.
 
As I said earlier if they can hold on for dear life and have smart leaders they could reconquer a sizable chunk of the western empire around 700 AD or so.
 
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