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In 122, they fortified the northern border with Hadrian’s Wall, which spanned what is now Northern England.
In 142 AD, Roman forces pushed north again and began construction of the Antonine Wall, which ran between the Forth-Clyde isthmus, but they retreated back to Hadrian’s Wall after only twenty years.
Although none of his own writings remain, writers during the time of the Roman Empire made much reference to them.
The extent to which this cultural and linguistic change was accompanied by wholesale changes in the population is still a matter of discussion.
Common Brittonic developed into the distinct Brittonic languages: Welsh, Cumbric, Cornish and Breton.