Yr Hen Ogledd (Welsh pronunciation: [ər ˌheːn ˈɔɡlɛð]), in English the Old North, is the region of Northern England and the southern Scottish Lowlands inhabited by Brittonic Celtic Britons during the post-Roman period and the Early Middle Ages. Its denizens spoke a variety of the Brittonic language known as Cumbric. The Hen Ogledd was distinct from the parts of northern Britain inhabited by the Picts, Anglo-Saxons, and Scots as well as from Wales, although the people of the Hen Ogledd were the same Brittonic stock as the Picts, Welsh and Cornish, and the region loomed large in Welsh literature and tradition for centuries after its kingdoms had disappeared.
The major kingdoms of the Hen Ogledd were Elmet in western Yorkshire; Gododdin in Lothian and the Scottish Borders; Rheged, centred in Cumbria; and Strathclyde situated around the Firth of Clyde. Smaller kingdoms or districts included Aeron, Calchfynydd, Eidyn, Lleuddiniawn, and Manaw; the latter three 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 Old North except Strathclyde were conquered by Anglo-Saxons and Picts by about 800; Strathclyde was incorporated into the rising Gaelic speaking Kingdom of Scotland in the 11th century.