Carausius Emperor (usurper) of the Britannic Empire from AD 286 to AD 293.
Marcus Aurelius Mausaeus Valerius Carausius was a military commander of the Roman Empire in the 3rd century, who usurped power in 286.

He declared himself emperor in Britain and northern Gaul (Imperium Britanniarum), only 13 years after the Gallic Empire was ended in 273.

He held power for seven years, fashioning the name "Emperor of the North" for himself, before being assassinated by his finance minister Allectus.
Carausius
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An BL Antoninianus struck AD 291-293 in Camulodunum
Obverse: IMP CARAVSIVS P AVG, radiate, draped and cuirassed bust right

Reverse: PROVIDE AV, Providentia standing left, holding spear and cornucopiae; C in exergue

Diameter: 25 mm
Die Orientation: 7 H
Weight: 4.82 g
One of several coins purchased from the North Yorkshire Moors Collection formed by Marvin Lessen (Dix Noonan Webb; 25/04/18; Lot 74). Bt J. Linzalone February 1992. Extremely rare and unlisted in the standard references.
RIC - ; Sear -
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An BL Antoninianus struck AD 289-290 in Londinium
Obverse: IMP CARAVSIVS P F AVG, radiate, draped and cuirassed bust right

Reverse: PAX AVG, Pax standing left, holding olive branch and vertical sceptre; ML in exergue

Diameter: 22 mm
Die Orientation: 6 H
Weight: 3.89 g
This coin is currently listed for sale on Ebay: https://www.ebay.co.uk/usr/closer-2-heaven
RIC 101; Webb 128; S 672A; Sear 13639A
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An AR Antoninianus struck AD 286-293 in Camulodunum
Obverse: IMP CARAVSIVS P F AVG, radiate, draped and cuirassed bust right

Reverse: LAETIT AVG, Laetitia standing facing, head left, holding wreath and anchor; C in exergue

Diameter: 24 mm
Die Orientation: 6 H
Weight: 3.53 g

Leu notes that this interesting coin is struck in good silver, which is very unusual for the radiates of Carausius; typically they are of a much baser metal. They suggest that it may have functioned as a trial strike for the very rare denarii from the ‘C’ mint.

RIC 250
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An BL Antoninianus struck AD 287-288 in Londinium
Obverse: IMP CARAVSIVS P F AVG, radiate, draped and cuirassed bust right

Reverse: PAX AVG, Pax standing left, holding olive branch and vertical sceptre; F-O across fields, ML in exergue

Diameter: 25 mm
Die Orientation: 12 H
Weight: 5.07 g

Ex. Roma Numismatics E-Sale 72; Lot 1329; Ex. Brian Henry Grover Collection; Ex. British Museum Collection (duplicate; exchanged for an antoninianus of Gallienus in 1969); Ex. Linchmere Hoard (1925)

RIC 101; Webb 131; Sear 13639A; S 672A
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An BL Antoninianus struck AD 287-290 in Londinium
Obverse: IMP CARAVSIVS P F AVG, radiate, draped and cuirassed bust right

Reverse: ADVENTVS AVG, emperor on horseback riding left, with right hand raised and holding sceptre, trampling captive seated left below hoof

Diameter: 20 mm
Die Orientation: 5 H
Weight: 4.51 g
This coin cited in P.H. Webb, The Reign and Coinage of Carausius (London, 1908); This coin cited in H. Mattingly & E.A. Sydenham (ed.’s), The Roman Imperial Coinage Vol V, Part II (London, 1933); Ex. Roma Numismatics Auction XX; Lot 661; Ex. Richard Cyril Lockett Collection (Glendining & Co., 6-9 June 1955; Lot 175); Ex. Percy H. Webb Collection
RIC 732 (this coin cited); Webb 821 (this coin)
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An BL Antoninianus struck AD 287-288 in Londinium
Obverse: IMP CARAVSIVS P F AVG, radiate, draped and cuirassed bust right

Reverse: LEG IIXX PRIMIG, Capricorn left; ML in exergue

Diameter: 21 mm
Die Orientation: 6 H
Weight: 4.12 g
Sam Moorhead has confirmed that there are less than 30 known examples of this rare type. Unusually, whilst the legend reads 'LEG IIXX' the legion referred to here is actually Legio XXII. Typically in poor condition, this one has one of the nicest Capricorns i've seen on these coins. It was discovered in Stevenage, Hertfordshire. According to Sear, Legio XXII Primigenia was probably raised by Caligula in AD 39 for his projected German campaign. It had several different stations during Julio-Claudian and Flavian times but from the reign of Domitian it was based in Mainz. There may have been a detachment serving in Britain at the time of Carausius’ revolt. (Roman Coins and their Values IV, David R Sear).
RIC 80; Webb 107; Sear 13618
(7) Maximian | Carausius
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An BL Antoninianus struck 292-293 AD in Londinium
Obverse: radiate and cuirassed bust right; IMP C MAXIMIANVS P F AVG

Reverse: Pax standing half left holding palm branch and long scepter; PAX__A_VGGG/ S_P / MLXXI

Diameter: 21 mm
Die Orientation: -
Weight: 3.4 g
292 - mid 293 AD
RIC V 34