"Some of it's coins are already in the France - Kingdom catalogue."
Oh, I did not see those! Maybe that is because they do not really belong there.
I would say to split it and move it to the Ancient section.
So there are essentially six issuers we need to deal with first? West Francia, East Francia, Middle Francia, Kingdom of Italy, Kingdom of Arles, and Lotharingia?
West Francia: I do not know much about the Capetian Dynasty or what dynasty changes mean for Numista's countries, but this place does not seem like the biggest problem. Either make France - Kingdom's cut off at 987 or at 843 (Capetian could either be made an issuer of France, or it can stay in France - Feudal, depending on what is decided).
East Francia: I think those would be best to keep in the German States, like they already are.
Middle Francia: that coin is listed under a German state. I would think to keep all German State coins together, so unless that coin is actually listed wrongly in the catalogue, I would think to keep it where it is.
Kingdom of Italy: I agree that the coins belong in the Italian States.
Kingdom of Arles: I have not been able to find a coin from this place. Arles was used as a mint of Rome, but that means nothing in this context. The Archbishopric of Arles has minted a few coins, but they are all listed under France - Feudal (and Numista has done the same with that place). But this is the Kingdom we are talking about, and if they did not issue a coin, I do not think they should be made an issuer.
Lotharingia: it looks like this place might have issued their own coins, but not while this place was whole. I have found a few anonymous coins listed as being in Lower Lotharingia, which are all past year 959 (
like this one).
(And of course, like a lot of historical things I seem to come across listed as 'Lower', it is actually located above Upper Lotharingia.)
And Lower Lotharingia is also known as the Duchy of Lower Lorraine, but the issue is for Lotharingia as a whole. Either way, I think that is in the same situation as Arles: they did not issue a coin, meaning they should not be an issuer.