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What if the remnant of the roman legions had stayed in Britannia and alongside the romano-british and celtic tribes had united and fought off the saxon invasion. Would this have allowed the proto welsh language to flourish and quickly see the celtic tribes establish a larger tribal kingdom as a result unifying the old roman province as a whole.
Eventually the 'welsh' empire annexing brittany and the isle of man and parts of northern france.
Would the welsh empire have as been as powerful as the british empire? With it having more links to the old western roman empire and the eastern roman empire as a basis for an imperial blueprint.