IIRC, which I'm certain I do, Julius Caesar was the FIRST Roman general to invade what is now Britain, and he had NO blacks in his legionary forces...NONE!
I shan't list all of the following generals/emperors that followed, but the last bunch was in the early 300A.D.s and nobody was having blacks in any of those armies either!
Nor are there ANY indications around Hadrians's Wall, that any of the bones and trinkets or even the graffiti, was made by, owned, or were black.
This is the same kind of cultural appropriations ( let's call it all what it REALLY is....UTTER BOVINE EXCREMENT! ) that sometimes now has a black in the Robin Hood/Richard the Lion Hearted stories.
The factual truth of the matter is that African blacks built NOTHING like the West nor some Asian cultures did, many, like American Indians didn't even have a wheel until whites came along!
And the last one was CONSTANTINE, who wasn’t the Western Empe4ror anyway!