[gleeaikin]

I presume that by Romani is meant the people also known as gypsies. As they were nomadic traders, tinkers and horsemen I don't think that finding the gene there is so surprising. Since it is mitochondrial DNA, then it means a woman is involved, so family travel makes sense.

Some time ago I read that the Romans used troops along Hadrians Wall from far in the East, Sythians or Sogdians I think it might have been.

[Verginius Rufus]

I'm not up on the archaeological remains in Norwich. Have they ever found graffiti saying "ROMANI EUNT DOMUS" there?

Or ROMANI ITE DOMUM for that matter?

[CobaltBlue]

The mitochondrial DNA could not have come from Roman troops. Troops are male.

You get mitochondrial DNA from females, only.

All males and all females get mitochondrial DNA from their mothers, but no males pass it on.

On the other hand, no females carry Y Chromosome DNA.

The reason archeologists study mitochondrial DNA is that it's much more resistant to decay than nuclear DNA.