Marcus Opellius Severus Macrinus Augustus was Roman Emperor from April 217 to 8 June 218.
He was appointed Praetorian Prefect by Caracalla, after having served for decades as a skilled lawyer and bureaucrat. When it was prophesied that he would depose and succeed the emperor, Macrinus - fearing for his safety - resolved to have Caracalla murdered before he was condemned.
In the spring of 217, Caracalla was in the eastern provinces. On April 8, while traveling to visit a temple, Caracalla was stabbed to death by a soldier whom Macrinus had recruited to commit the murder.
However, Macrinus' economic reforms quickly angered the legions, and by June he was overthrown by a rebellion supporting Elagabalus.
He was appointed Praetorian Prefect by Caracalla, after having served for decades as a skilled lawyer and bureaucrat. When it was prophesied that he would depose and succeed the emperor, Macrinus - fearing for his safety - resolved to have Caracalla murdered before he was condemned.
In the spring of 217, Caracalla was in the eastern provinces. On April 8, while traveling to visit a temple, Caracalla was stabbed to death by a soldier whom Macrinus had recruited to commit the murder.
However, Macrinus' economic reforms quickly angered the legions, and by June he was overthrown by a rebellion supporting Elagabalus.

(1)
Macrinus
217-218 AD
Obverse:
laureate and draped bust right; AVT KA M__O C MAKPINOC CE
Reverse:
eagle facing, head right, wreath in beak, head of bull below; ΔHMAPX EΞ VΠAT A
(2)
Macrinus
217-218 AD
Obverse:
laureate, draped and cuirassed bust right from behind; AYT·K·M·OΠ_·CE·MAKPINOC·CE
Reverse:
eagle facing, head left, wreath in beak, winged creature below; ΔHMAPX·_EΞ·YΠATOC Π Π / B_E
(3)
Macrinus
217-218 AD
Obverse:
laureate, draped and cuirassed bust right; AYT·K·M·OΠ·CE·MAKPINOC CEB
Reverse:
eagle facing, head right, wreath in beak, thigh of sacrificial animal below; ·ΔHMAPX·EΞ·_VΠA·TO· / ·Δ·_·E·
(4)
Macrinus
217-218 AD
Obverse:
laureate, draped and cuirassed bust right from behind; AVT·KAI·M·OΠ·C ··· E·MAKPINOC
Reverse:
eagle facing, head left, wreath in beak, date palm right, crescent over crab below; ΔHMAPX EΞ VΠATOC Π Π
(5)
Macrinus
217-218 AD
Obverse:
Laureate, draped and cuirassed bust right; AVT·K·M·OΠ·CE·_MAKPEINOC C
Reverse:
Eagle facing, head left, wreath in beak, Three Graces standing within wreath between legs; Δ_HMAPX_·EΞ·YΠATOC Π Π
(6)
Macrinus
217-218 AD
Obverse:
laureate, draped and cuirassed bust right AYT·K·M·OΠEΛ_·CE·MAKPINOC_·CE
Reverse:
eagle facing, head right, wreath in beak, lion right between legs ΔHMAP·X·EΞ·VΠATOC
(7)
Macrinus
217-218 AD
Obverse:
laureate head right; AVT K M O CE MAKPINOC CE
Reverse:
within wreath: Δ / S·C / E
(8)
Macrinus
217-218 AD
Obverse:
AVT K MOC MAKPINOC CE, Laureate head right
Reverse:
SC, delta above, all in laurel wreath
(9)
Macrinus
217-218 AD
Obverse:
laureate, draped and cuirassed bust right
Reverse:
eagle facing, head right, wreath in beak, shrine below; ΔHMAP·X·EΞ VΠATOC
(10)
Macrinus
217-218 AD
Obverse:
laureate cuirassed bust right; IMP C M OPEL SEV MACRINVS AVG
Reverse:
Salus seated left, holding patera over altar from which a snakes rises to eat offering; SALVS PVBLICA
(11)
Macrinus
217-218 AD
AE
unit
Nicopolis ad Istrum
Obverse:
ΑVΤ Κ Μ ΟΠΕΛΛ CΕV ΜΑΚΡΙΝΟC, Bust of Macrinus facing right, wearing laurel wreath and cuirass, showing back
Reverse:
VΠ CΤΑ ΛΟΝΓΙΝΟΥ ΝΙΚΟΠΟΛΙΤΩΝ ΠΡΟC ΙCΤΡΟΝ, Artemis standing facing right, holding bow and reaching for an arrow from quiver on her back