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Background:
Gaulish is the language of the Gaulish people, a Celtic ethnicity that was spread across most of France, Belgium, Southern Germany, Southern Netherlands, Switzerland, Luxembourg, Austria, Southern Czech republic, and Northern Italy, and the Belgic Gauls colonized southern England, and many Gaulish refugees immigrated to Britain after Caesar's Gaulish conquest.
It's closest modern relatives are the Bythonnic languages (Welsh, Cornish, and Breton) both having fundemental P-celtic features, such as the evolution of proto celtic Kw (pronounced as a k with rounded lips) to P and mr/ml to br/bl as well as well as wo/we to wa, Gw to w, and the proto celtic word anman "name" to anwan. All of these features being more basal and ingrained then the later grammar changes that occurred in insular celtic around 500 AD do to the sprachbund effect with the the irish being converted to celtic christianity by the welsh and their by slowly gaining aspects of their language do to religious and cultural isolation from then pagan Anglo-saxons blocking them in.
It has been observed in some late Gaulish inscriptions (usually on pottery) that some of the later changes made to first welsh aroun 350-400 and then irish around 400-700 happened to Gaulish in it's later years before it's death around the end of this time period.
basic sound changes:
The basic changes supported by the late inscriptions...
Classical_Dark age
Gaulish__Gaulish (when in the middle of a word)
p_______b
t_______d
c_______g
b_______v
d_______dh (dh pronounced like th in the)
g_______j/gh (j like german j, j when in between 2 vowels)
(gh pronounced like hissy ch but voiced like g)
m______m/w (w if the m was the second of a 2 consonant cluster)
u/w_____β (pronounced like a weak, breathy v with a more open mouth)
(that last change is in my opinion supported by some loan words into french, but the people who made the original theory suggested gw like in old welsh)
If you want to see the real site with the people who originally adapted the theory and concept, go here https://www.moderngaulish.org/
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