Diadumenian - Augustus of Imperium Romanum from 218 to 218
Marcus Opellius Antoninus Diadumenianus Augustus was the son of the Roman Emperor Macrinus, and served his father briefly as Caesar (May 217–218) and as Augustus (in 218).

The name stems from him being born with a caul that formed a 'diadem'.

Diadumenian had little time to enjoy his position or to learn anything from its opportunities because the legions of Syria revolted and declared Elagabalus ruler of the Roman Empire. When Macrinus was defeated on 8 June 218, at Antioch, Diadumenian's death followed his father's.
Emperor Diadumenian of the Roman Empire

(1) Diadumenian 217-218 AD
Obverse: bare head right; K M OΠΠEΛ ANTΩNI ΔIAΔOVMENIANOC
Reverse: Homonoia facing, head left, holding patera and cornucopia; VΠ AΓPIΠΠA NIK_OΠOΛITΩN ΠΡOCIC / TΡΩ
Ref: AMNG I 1817f. (Var.); Varbanov 3641
(2) Diadumenian 217-218 AD
Obverse: Κ Μ ΟΠΠΕΛ ΑΝΤΩΝΙ ∆ΙΑ∆ΟΥΜΕΝΙΑΝΟC, Bare bust of Diadumenian facing right
Reverse: VΠ ΑΓΡΙΠΠΑ ΝΙΚΟΠΟΛΙΤΩΝ ΠΡΟC ICT, City-gate flanked by two towers and with a taller third tower rising from center (or from behind)
Ref: Varbanov 3639
(3) Diadumenian 217-218 AD
Obverse: draped and cuirassed bust right; M OP DIADVMENIAN[V?] CAE
Reverse: Serapis head right wearing modius; COL·P·FL·AV_F·C·CAESAR
Ref: Kadman 78; SNG ANS 801; Rosenberger...
(4) Diadumenian 218
Obverse: K M OΠΠEΛ ANTΩNINOC, bare-headed, draped bust right, seen from the back
Reverse: NIKOΠOΛITΩN, serpent-entwined staff of Asklepios
Ref: AMNG 1885; Varbanov 3598 var (bust...
(5) Diadumenian 217-218 AD
Obverse: draped and cuirassed bust right from behind; K M OΠΠEΛ__ANTΩNINOC
Reverse: Asklepian snake-encircled staff; NIKOΠO_ΛITΩN
Ref: Varbanov 3598 var. (bust type)
(6) Diadumenian 217-218 AD
Obverse: Cuirassed bust right; KAIC•M•OΠ•ΕΛ•ANTΩNINOC
Reverse: Eagle standing facing on leg and thigh of animal, head and tail right, with wings spread, holding wreath in beak; ·Δ·_·Є· across upper field; ΔHMAPX•ΕΞ•YΠA•TO
Ref: McAlee 744; Prieur 248 corr. (obv. ...
(7) Diadumenian 218 AD
Obverse: M OΠEΛ ΔIAΔOVMENIANOC KAI / bare-headed, draped and cuirassed bust right
Reverse: VΠ CTA ΛONΓINOV NI[KOΠOΛITΩN] ΠPOC IC / Nemesis-Dikaiosyne standing facing, head left, holding scales and sceptre; wheel at feet
Ref: Varbanov 3725 var. (obv. leg.).
(8) Macrinus | Diadumenian 217-218 AD
AE 5 assaria Marcianopolis
Obverse: AV K OΠEΛ CEVH MAKPEINOC K M OΠEΛ ANTΩNEINOC / Laureate, draped and cuirassed bust of Macrinus right facing bare headed, draped and cuirassed bust of Diadumenian left
Reverse: VΠ ΠONTIAN-O-V MAPKIANOΠOΛEI / TΩ-N / Demeter standing right, holding 2 corn-ears in left hand and a sceptre in right. E in upper right field
Ref: None provided