Caligula Emperor of the Roman Empire from 37 to 41.
Gaius Julius Caesar Augustus Germanicus was Roman emperor from AD 37–41.

Caligula's biological father was Germanicus, and he was the great-nephew and adopted son of Emperor Tiberius. He earned the nickname "Caligula" from his father's soldiers while accompanying him during his campaigns in Germania.

He is described as a noble and moderate ruler during the first six months of his reign. After this, the sources focus upon his cruelty, sadism, extravagance, and sexual perversity, presenting him as an insane tyrant.

In early AD 41, Caligula was assassinated as a result of a conspiracy by officers of the Praetorian Guard, senators, and courtiers.
Caligula
Epithet: Caligula ("Little Soldier's Boot")
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An AE As struck 37-38 AD in Rome
Obverse: C CAESAR AVG GERMANICVS PON M TR POT, bare head left

Reverse: VESTA, Vesta enthroned left, patera extended in right, long scepter transverse in left, S - C flanking across field

Diameter: 29.6 mm
Die Orientation: 12 H
Weight: 8.87 g
Large punched hole
RIC I 38, Cohen I 27, BMCRE I 46, SRCV I 1803
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An AE As struck AD 37-38 in Rome
Obverse: C CAESAR AVG GERMANICVS PON M TR POT, bare head left

Reverse: VESTA, Vesta seated left on ornamental throne, holding patera and sceptre; S-C across field

Diameter: 28 mm
Die Orientation: 7 H
Weight: 10.67 g
No notes for this coin
RIC 38; Sear 1803
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An AE unit struck 37-41 AD in Aphrodisias
Obverse: laureate head right; ΓAIOΣ__KAIΣAP

Reverse: diademed head of Aphrodite right; AΦPOΔI_ΣIEΩN

Diameter: -
Die Orientation: -
Weight: 4 g
No notes for this coin
RPC I 2845; BMC 97-8.
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An AE As equivalent struck 37-41 AD in Thessalonica
Obverse: Γ KAIΣAΡ ΣEBAΣTOΣ, Head of Caligula facing left, wearing laurel wreath

Reverse: ΓEΡMANIKOΣ ΘEΣΣAΛONIKEΩN, Bare head of Germanicus facing left

Diameter: 21 mm
Die Orientation: 6 H
Weight: 9.03 g
Leaded bronze
RPC I 1572; Touratsoglou, Caligula 1-2
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An AE unit struck 37-41 AD in Thessalonica
Obverse: Laureate head left; Γ KAIΣAP ΘEΣΣAΛONIKEΩN

Reverse: Veiled bust of Antonia (grandmother of Caligula); ANTΩNIA_ΣEBAΣTH

Diameter: -
Die Orientation: -
Weight: 8.41 g
No notes for this coin
RPC 1574
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An AE unit struck 37-41 AD in Thessalonica
Obverse: Laureate head left; Γ KAIΣAP ΘEΣΣAΛONIKEΩN

Reverse: Veiled bust of Antonia (grandmother of Caligula); ANTΩNIA_ΣEBAΣTH

Diameter: -
Die Orientation: -
Weight: 9.96 g
No notes for this coin
RPC 1574
(7) Caligula | Aspurgus
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An AE 12 Units struck 37-38 AD in Pantikapaion
Obverse: ΓAIOY KAIΣAΡOΣ ΓEΡMANIKOY, Bare head of Caligula facing right

Reverse: No inscription, Head of King Aspurgus facing right, wearing diadem; BAP monogram and IB in fields

Diameter: 22 mm
Die Orientation: 12 H
Weight: 7.76 g
No notes for this coin
RPC I 1904
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An AE unit struck 37-41 AD in Cnossus
Obverse: C CAESAR AVG GERMANICVS, Bare head of Caligula facing right

Reverse: GER CAESAR PVLCHRO III VARIO IIVIR, Bare head of Germanicus facing right

Diameter: 22 mm
Die Orientation: 12 H
Weight: 6.67 g
Pulcher III Varius IIviri
RPC I 994
(9) Rhoemetalces III | Caligula
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An AE unit struck 38-41 AD in Thrace
Obverse: Diademed draped bust of Rhoemetalces III left; BAΣIΛEYΣ_POIMHTAΛKAΣ

Reverse: Laureate head of Caligula left; ΓAIΩ KAIΣAP_I ΣEBAΣΤΩ

Diameter: -
Die Orientation: -
Weight: 10.77 g
Kingdom of Thrace
Caligula RPC 1723; BMC 2; Jurukova 209; SGI 5407; Moushmov 5805