At post 18, it was noted that this was the time of the migration of the Celts to Britain. I wonder if, upon their arrival, they stumbled into Bran Mak Morn and his merry band of Picts.
I suspect (based upon readings from the book Where Troy Once Stood, and other information) that there was at least one major migration of Celts into Britain much earlier, probably no later than 1600 BC.
At that time (650BC) the Milesian Celts still depended on Greek scribes, so their business was recorded in Greek. The Galicians have such materials.
Remember, during this period some Celtic areas were very primitive ~ not quite bronze age, and other Celtic areas were very advanced.
The Romans (300BC) regularly hunted for suitible agricultural slaves in what is now Serbia, et al. That's where we get our word "Slav".
My impression is there are a lot of folks who want to be Picts ~ probably in the belief that they were brave warriors who harrassed the Roman invaders (who were presumably all Italians).
It's most likely that the Roman agriculturalists who came to Britain were as Celtic as the folks already there ~ probably a lot of them from Spain (already a Roman colony since the defeat of Carthage), and others from Province (literally a part of Rome in Gaul for centuries), and most likely surplus/excess warrior types from Ireland ~ readily hired by the Romans.
Remember, Rome didn't invade and conquer Ireland. Recent archaeological finds demonstrate a surprisingly high technological standard in the Ireland of those days ~ dentistry, eye surgery, trepanning techniques, bone setting, etc.
Regarding the Roman army that settled in Britain, it, too seemed to have something other than a Mediterranean origin. The King Arthur story (if not King Arthur) appears to have originated North of the Black Sea in an area favored by the Romans for soldiery on the Empire's periphery ~ probably "cold adapted" people!
Current DNA studies even show that the underlying population in Britain continues to be of predominantly Celtic origin with only a smidgeon of Saxon or Mediterranean ancestry in the mix.
Fur Shur the invaders of 650 BC brought their languages with them, and were able to culturally and politically dominate Ireland and later Britain. Genetically they brought enough of the neighboring Basque population with them to create the current situation which is that the Irish and the Basques are essentially the exact same people (genetically). No doubt later periods saw even more Basques arrive in Britain from Spain and Gaul.
By the time we get up to 750 AD, the Celts from Spain were moving from Britain into Brittany, and, just a tad later, back into Spain as Cornish knights come to kick some Moslem booty!
That particular Howard character showed some promise, but between his being a quantity-over-quality kind of guy, and having shortened his own life, it might have been interesting to see what he’d have done with Bran Mak Morn.