Teejay
Gone Fishin'
During the Roman occupation of Britain, the population becomes much more Romanised than in OTL to the extent that at least in the province of Britannia about the time the Roman forces leave British Vulgar Latin is the predominant language of the province.
Brythonic in the following centuries becomes an extinct, this process would be likely-hood in this TL Irish colonies in what is now Wales and Cornwall in the fifth century CE are much stronger and become Gaelic speaking. Not to mention the Irish colonies establishing themselves into lasting Gaelic kingdoms. Also instead of OTL Britanny becoming Brythonic speaking during the 5th century CE, it could be quite likely that Irish kingdoms of established instead and Gaelic becoming the main language spoken in Western Armorica
Also that during the Anglo-Saxon migrations, instead of Old English replacing Brythonic and probably Vulgar Latin in Britannia. The incoming Anglo-Saxons adopt British vulgar Latin instead, which happened to the Franks in Gaul. Although this British language would get a large number of Anglo-Frisian loanwords Also if the Norse conqueror the whole or a lot of Britannia, they would introduce Norse loanwords into the British language as well.
So the language map in this TL, would have British Romance being spoken where Old English was during the second half of the 1st millennium BCE and Gaelic being spoken in OTL Cornwall, Wales and Britanny.
I would imagine that this British Romance language would be closest to the Languages d'oïl of what is now Northern France. Since both had an influence from both P-Celtic (Gaulish and Brythonic) and Germanic (Frankish and Anglo-Frisian) languages. Also it might be closer to the Norman language if it gets influenced by Old Norse.
Back to the TL, after Roman rule collapses the Anglo-Saxons conqueror Britannia and established various kingdoms. However Romano-British culture survives and the Anglo-Saxons assimilate into it. Along with them converting in time to Christianity
Brythonic in the following centuries becomes an extinct, this process would be likely-hood in this TL Irish colonies in what is now Wales and Cornwall in the fifth century CE are much stronger and become Gaelic speaking. Not to mention the Irish colonies establishing themselves into lasting Gaelic kingdoms. Also instead of OTL Britanny becoming Brythonic speaking during the 5th century CE, it could be quite likely that Irish kingdoms of established instead and Gaelic becoming the main language spoken in Western Armorica
Also that during the Anglo-Saxon migrations, instead of Old English replacing Brythonic and probably Vulgar Latin in Britannia. The incoming Anglo-Saxons adopt British vulgar Latin instead, which happened to the Franks in Gaul. Although this British language would get a large number of Anglo-Frisian loanwords Also if the Norse conqueror the whole or a lot of Britannia, they would introduce Norse loanwords into the British language as well.
So the language map in this TL, would have British Romance being spoken where Old English was during the second half of the 1st millennium BCE and Gaelic being spoken in OTL Cornwall, Wales and Britanny.
I would imagine that this British Romance language would be closest to the Languages d'oïl of what is now Northern France. Since both had an influence from both P-Celtic (Gaulish and Brythonic) and Germanic (Frankish and Anglo-Frisian) languages. Also it might be closer to the Norman language if it gets influenced by Old Norse.
Back to the TL, after Roman rule collapses the Anglo-Saxons conqueror Britannia and established various kingdoms. However Romano-British culture survives and the Anglo-Saxons assimilate into it. Along with them converting in time to Christianity