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The Deceangli or Deceangi (Welsh: Tegeingl) were one of the Celtic tribes living in Britain, prior to the Roman invasion of the island. The tribe lived mainly in what is now north-east Wales, though it is uncertain whether their territory covered only the modern counties of Flintshire, Denbighshire and part of Cheshire in what is now present day England or whether it extended further west. The tribe occupied an area between the Clwyd and Dee rivers. They lived in hill forts running in a chain through the Clwydian Range and their tribal capital was Canovium.
Assaults on the Welsh tribes were made under the legate Publius Ostorius Scapula who attacked the Deceangli in 48 AD. They appear to have surrendered with little resistance, unlike the Silures and the Ordovices who put up a long and bitter resistance to Roman rule. No Roman town is known to have existed in the territory of this tribe, though the auxiliary fort of Canovium (Caerhun) was probably in their lands and may have had a civilian settlement around it.
Roman mine workings of lead and silver are evident in the regions occupied by the Deceangli. Several sows of lead have been found in Chester, one weighing 192 lbs bears the markings: IMP VESP AVGV T IMP III DECEANGI. Another, found near Tarvin Bridge, weighing 179 lbs is inscribed: IMP VESP V T IMP III COS DECEANGI and is dated to 74 CE. Both are displayed in the Grosvenor Museum.
- "RBO - Deceangi". roman-britain.org. Retrieved 14 January 2014.
- "Kingdoms of British Celts - Gangani & Deceangli (Decangi)". historyfiles.co.uk. Retrieved 14 January 2014.
- Jones, B.; Grealey, S.; Bestwick, J.D. (1974). Roman Manchester. Sherratt for Manchester Excavation Committee. ISBN 9780854270415.
- Davies, J. (2007). A History of Wales. Penguin Adult. ISBN 9780140284751.
- Jones, P. (2009). Illustrated History of Chester. DB Publishing. ISBN 9781859836842.