Nice !!!
I'm Briton Myself, so I will try this mod as soon as possible.
For Jecrell, and all those that don't know much about Brittany's history, I'll tell you that :
First some definitions :
Bretagne, is a French word for Brittany.
In English, it's habitants are called Britons, and in French we're called Bretons.
We are on an English speaking forum, so I will use the English words.
The (Old) Britons were the people who lived in Great Britain before the Anglo-Saxons. They were first conquered by Cesar the Roman.
In Legends, our ancestors had a Great King, the very famous Arthur who vainquished the Anglo-Saxons.
In real history, the Britons were defeated by the Anglo-Saxons, and pushed to the west of Great Britain. The Anglo-Saxons therefore created England, chasing away the Britons, it happened gradually during the 5th and 6th Century.
Wales and Cornwall became overpopulated, so many Britons migrated to the continent peninsula called Armorica by the romans.
The Welsh, and the Cornish did not kept the name of "Britons", but in fact those people have the same ancestors as the "modern" (Continental) Britons.
The "modern" Britons arise as an independent nation, during the 9th an 10th Century, especially under the rule of King Nominoë, and his son Erispoë (around 850AD).
Brittany standed independant as a great Duchy until 1532AD, short after the death of Anne de Bretagne, the last great duchess of Brittany. She was forced to mary two French Kings, Charles VIII and Louis XII, but managed to keep Brittany independant.
Since 1532AD, Brittany is part of France, but kept many of its own specificities :
Our language is endangered, but still alive.
We have a different culture as the rest of France.
And thanks to Anne de Bretagne we have free motorways !
Concerning the mod, I would have seen better Nominoë, in place of Du Guesclin, but anyway, thanks for the mod.
I'm gonna try it in my next Civ game (that is to say soon 
)
I already saw Euskadi and Ch'ti in the list ...
