- 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
bare head right; K M OΠΠEΛ ANTΩNI ΔIAΔOVMENIANOC
Homonoia facing, head left, holding patera and cornucopia; VΠ AΓPIΠΠA NIK_OΠOΛITΩN ΠΡOCIC / TΡΩ
Ref: AMNG I 1817f. (Var.); Varbanov 3641
Κ Μ ΟΠΠΕΛ ΑΝΤΩΝΙ ∆ΙΑ∆ΟΥΜΕΝΙΑΝΟC, Bare bust of Diadumenian facing right
VΠ ΑΓΡΙΠΠΑ ΝΙΚΟΠΟΛΙΤΩΝ ΠΡΟC ICT, City-gate flanked by two towers and with a taller third tower rising from center (or from behind)
draped and cuirassed bust right; M OP DIADVMENIAN[V?] CAE
Serapis head right wearing modius; COL·P·FL·AV_F·C·CAESAR
Ref: Kadman 78; SNG ANS 801; Rosenberger...
K M OΠΠEΛ ANTΩNINOC, bare-headed, draped bust right, seen from the back
NIKOΠOΛITΩN, serpent-entwined staff of Asklepios
Ref: AMNG 1885; Varbanov 3598 var (bust...
draped and cuirassed bust right from behind; K M OΠΠEΛ__ANTΩNINOC
Asklepian snake-encircled staff; NIKOΠO_ΛITΩN
Ref: Varbanov 3598 var. (bust type)
Cuirassed bust right; KAIC•M•OΠ•ΕΛ•ANTΩNINOC
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. ...
M OΠEΛ ΔIAΔOVMENIANOC KAI / bare-headed, draped and cuirassed bust right
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.).