Galerius Emperor of the Roman Empire from 305 to 311.
Gaius Galerius Valerius Maximianus Augustus was Roman Emperor from 305 to 311.

He served with distinction as a soldier under Emperors Aurelian and Probus, and in 293 at the establishment of the Tetrarchy, was designated Caesar along with Constantius Chlorus, receiving in marriage Diocletian's daughter Galeria Valeria.

Galerius was promoted to Augustus in 305, and laboured for the rest of his rule to become the sole emperor. In vain, of course.

He died in late April or early May 311 from a horribly gruesome disease described by Eusebius and Lactantius, possibly some form of bowel cancer, gangrene or Fournier gangrene.
Galerius
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An BL Follis struck 308-311 AD in Thessalonica
Obverse: GAL MAXIMIANVS PF AVG

Reverse: GENIO AVGVSTI, Genius waring modius standing left holding patera from which liquid flows and cornucopiae

Diameter: 25 mm
Die Orientation: 0 H
Weight: 5 g
No notes for this coin
Sear 14507
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An AE Follis struck AD 301 in Siscia
Obverse: MAXIMIANVS NOB CAES, laureate head right

Reverse: SACRA MONET AVGG ET CAESS NOSTR, Moneta standing left, holding scales and cornucopiae. Star in left field, B in right field.

Diameter: 0 mm
Die Orientation: 0 H
Weight: 0 g
No notes for this coin
RIC VI Siscia 135b
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An AE Follis struck 298-299 AD in Thessalonica
Obverse: Laureate head r.

Reverse: Genius standing l., holding patera and cornucopia; TSA.

Diameter: 27 mm
Die Orientation: 6 H
Weight: 9.47 g
No notes for this coin
RIC VI 20b
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An AE Follis struck 308-309 AD in Heraclea
Obverse: laureate head right; IMP GAL VAL MAXIMIANVS P F AVG

Reverse: Genius standing left, pouring out patera and holding cornucopia; GENIO IMP_E_RATORIS / ·HTA·

Diameter: 25 mm
Die Orientation: -
Weight: 8.43 g
No notes for this coin
RIC VI Heraclea 37a
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An AE Follis struck 309-311 AD in Siscia
Obverse: laureate head right; IMP MAXIMIANVS P F AVG

Reverse: Genius standing left, wearing chalmys, holding cornucopia, pouring libations from patera; GENIO A_VGVSTI/ crescent _A / SIS

Diameter: -
Die Orientation: -
Weight: 5.84 g
No notes for this coin
RIC VI Siscia 198a/207a
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An AE Post-reform Radiate struck 303 AD in Carthage
Obverse: Radiate, draped and cuirassed bust right from behind; GAL VAL MAXIMIANVS NOB C

Reverse: Legend within wreath; VOT / X / F K

Diameter: -
Die Orientation: -
Weight: 3.1 g
scarce
RIC VI Carthage 36
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An AE Follis struck 299-300 AD in Antioch
Obverse: laureate head right; GAL VAL MAXIMIANVS NOB CAES

Reverse: Genius standing left, wearing modius and chalmys, pouring libations from patera, holding cornucopia; GENIO POPV_LI ROMANI / Γ / ANT

Diameter: -
Die Orientation: -
Weight: 9.9 g
No notes for this coin
RIC VI Antioch 53b
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An AE Post-reform Radiate struck 299 AD in Ticinum
Obverse: radiate, cuirassed bust right; GAL VAL MAXIMIANVS NOB C

Reverse: legend within wreath; VOT / . / X / T

Diameter: 21 mm
Die Orientation: -
Weight: 3.73 g
No notes for this coin
RIC VI Ticinum 39b
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An AE Follis struck 304-305 AD in Antioch
Obverse: laureate head right; GAL VAL MAXIMIANVS NOB CAES

Reverse: Genius standing left, wearing modius and chalmys, pouring libations from patera, holding cornucopia; GENIO POPV_LI ROMANI • / Z / ANT

Diameter: -
Die Orientation: -
Weight: -
No notes for this coin
RIC VI Antioch 59b
(10) Galerius
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An AE Follis struck 300-301 AD in Antioch
Obverse: GAL VAL MAXMIMIANVS NOB CAES, Head of Galerius facing right, wearing laurel wreath

Reverse: GENIO POPVLI ROMANI, Genius standing facing left, modius on head, nude except for chlamys on left shoulder (falls low); holding cornucopia in left hand and pouring libation from patera in right; K in left field; Epsilon over V in right field; ANT in exer

Diameter: 27 mm
Die Orientation: 5 H
Weight: 8.97 g
No notes for this coin
RIC VI 55b
(11) Galerius
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An AE Follis struck 307-308 AD in Nicomedia
Obverse: IMP C GAL VAL MAXIMIANVS P F AVG, Head of Galerius facing right, wearing laurel wreath

Reverse: GENIO POPVLI ROMANI CMH (in ligature), Genius, wearing modius, nude, chlamys draped over left shoulder, standing facing left, pouring liquid from patera in right hand and holding cornucopia in left; SMNB in exergue

Diameter: 27 mm
Die Orientation: 12 H
Weight: 6.68 g
No notes for this coin
RIC VI Nicomedia 51 var. (officina)