Hen Ogledd contains the administrative territorial entity Kingdom of Rheged
Yr Hen Ogledd (Welsh pronunciation: [ər ˌheːn ˈɔɡlɛð]), 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 North Britain inhabited by the Picts, Anglo-Saxons, and Scoti.
The major kingdoms of the Hen Ogledd were Elmet, Gododdin, Rheged, and the Kingdom of Strathclyde. Smaller kingdoms included Aeron and Calchfynydd. Eidyn, Lleuddiniawn, and Manaw Gododdin were evidently parts of Gododdin. The Angle kingdoms of Deira and Bernicia both had Brittonic-derived names, suggesting they may have been Brittonic kingdoms in origin. All the kingdoms of the Hen Ogledd except Strathclyde were conquered by Anglo-Saxons and Picts by about 800; Strathclyde was incorporated into the rising Middle Irish-speaking Kingdom of Scotland in the 11th century.
The memory of the Hen Ogledd remained strong in Wales. Welsh tradition included genealogies of the Gwŷr y Gogledd, or Men of the North, and several important Welsh dynasties traced their lineage to them. A number of important early Welsh texts were attributed to the Men of the North, such as Taliesin, Aneirin, Myrddin Wyllt, and the Cynfeirdd poets. Heroes of the north such as Urien, Owain mab Urien, and Coel Hen and his descendants feature in Welsh poetry and the Welsh Triads.
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