Question: Meirchion Gul was a King of which Brittonic-speaking region of Northern England and Southern Scotland?
Sentence (from "Meirchion Gul"): Meirchion Gul was probably a late 5th-century king of Rheged, a Brythonic realm in the area of sub-Roman known as the "Hen Ogledd" (in the North of England and Southern Scotland today).
Relevant evidence: Yes