Rheged was one of the kingdoms of the Hen Ogledd, the Brittonic-speaking region of what is now Northern England and southern Scotland, during the post-Roman era and Early Middle Ages. It is recorded in several poetic and bardic sources, although its borders are not described in any of them. A recent archaeological discovery suggests that its stronghold was located in what is now Galloway in Scotland rather than, as was previously speculated, being in Cumbria. Rheged possibly extended into Lancashire and other parts of northern England. In some sources, Rheged is intimately associated with the king Urien Rheged and his family. Its inhabitants spoke Cumbric, a Brittonic dialect closely related to Old Welsh.

Yr Hen Ogledd, or in English the Old North, is the historical region that was inhabited by the Brittonic people of sub-Roman Britain in the Early Middle Ages, now Northern England and the southern Scottish Lowlands, alongside the Celtic Kingdom of Elmet. Its population spoke a variety of the Brittonic language known as Cumbric which is closely related to, if not a dialect of Old Welsh. The people of Wales and the Hen Ogledd considered themselves to be one people, and both were referred to as Cymry ('fellow-countrymen') from the Brittonic word combrogi. The Hen Ogledd was distinct from the parts of Great Britain inhabited by the Picts, Anglo-Saxons, and Scoti.