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 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; F-O across fields

Diameter: 24 mm
Die Orientation: 6 H
Weight: 5.33 g
One of several coins purchased from the North Yorkshire Moors Collection formed by Marvin Lessen (Dix Noonan Webb; 25/04/18; Lot 57) Ex. Arethusa Auction 4 (Lugano), 22 March 1996, Lot 655
RIC 101; Webb 128; S 672A; Sear 13639A
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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
(6) 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: -
Die Orientation: -
Weight: 3.4 g
292 - mid 293 AD
RIC V 34