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The Deceangli or Deceangi (Welsh: Tegeingl) were one of the Celtic tribes living in Wales, before and during the Roman invasion of Britain. The tribe lived in Wales and west Cheshire but it is uncertain whether their territory covered only the modern counties of Flintshire, Denbighshire and part of Cheshire in what is now England or whether it extended further west into Gwynedd. 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 AD 74. Both are displayed in the Grosvenor Museum.
- "RBO - Deceangi". roman-britain.org. Archived from the original on 6 December 2013. 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.