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Concept
Deira
Résumé
Deira ('daɪr@,_'deɪr@ ; Old Welsh/Deywr or Deifr; Derenrice or Dere) was an area of Post-Roman Britain, and a later Anglian kingdom.
The name of the kingdom is of Brythonic origin, and is derived from the Proto-Celtic *daru, meaning 'oak' (derw in modern Welsh), in which case it would mean 'the people of the Derwent', a derivation also found in the Latin name for Malton, Derventio. It is cognate with the modern Irish word doire (ˈd̪ɣɛɾjə); the names for County Londonderry and the city of Derry stem from this word.
Following the Roman withdrawal from Britain a number of successor kingdoms rose in northern England, reflecting pre-Roman tribal territories. The area between the Humber and River Tees known as Deywr or Deifr corresponds to the tribal lands of the Parisi, bordered to the west and north by the Brythonic kingdoms of Elmet (Elfed) and Bernicia (Bryneich) respectively, and to the east by the North Sea.
Early Deira may have centred on Petuaria (modern Brough) and archaeological evidence shows that the town was refortified. Petuaria was a great tribal centre for the Parisi, but declined in importance from the mid-fourth century (possibly as the harbour silted up). After this period, Derventio (modern Malton) may have functioned as the region's capital.
It is not known if Deira was ever an independent Brythonic kingdom, and no British king has been identified with the area from the surviving genealogies, poems or chronicles. However the area was subject to the same fractious inheritance traditions and changing power dynamic (following the Roman withdrawal) that allowed Elmet and Bernicia to become independent hereditary kingdoms in the early fifth century. In Welsh literature, Deira is part of the Hen Ogledd (The Old North) region, which was divided into many related kingdoms after the death of Coel Hen (Coel the Old).
The kingdom, which was previously ruled by a British dynasty, was probably created in the third quarter of the fifth century when Anglian warriors invaded the Derwent Valley.
Source officielle
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