Coins from Bithynia
Bithynia was an ancient region, kingdom and Roman province in the northwest of Asia Minor, adjoining the Propontis, the Thracian Bosporus and the Euxine Sea.

It bordered Mysia to the southwest, Paphlagonia to the northeast along the Pontic coast, and Phrygia to the southeast towards the interior of Asia Minor.

Bithynia was an independent kingdom from the 4th century BC. Its capital Nicomedia was rebuilt on the site of ancient Astacus in 264 BC by Nicomedes I of Bithynia. Bithynia was bequeathed to the Roman Republic in 74 BC, and became united with the Pontus region as the province of Bithynia et Pontus

Bithynia

(1) Arcadius AD 402
Obverse: D N ARCADIVS P F AVG, Cuirassed bust with helmeted head facing, holding spear and shield
Reverse: CONCORDIA AVGG, Constantinopolis seated in front, holding Victory on globe and sceptre
Ref: Sear 20805
(2) Arcadius 392-395 A.D.
AE unit Nicomedia
Obverse: D N ARCADI-VS P F AVG, diademed, draped and cuirassed bust right
Reverse: GLORIA ROMANORVM, emperor standing facing, head right, holding labarum and globe
Ref: RIC IX 46b
(3) Arcadius 383 AD
Obverse: pearl-diademed, draped and cuirassed bust right; D N ARCADIVS P F AVG
Reverse: VOT / V within wreath; SMNΓ
Ref: RIC IX Nicomedia 37c
(4) Chalcedon | Lysimachos c. 250-100 BC
Obverse: Head of the deified Alexander with diadem and Ammon's horns right
Reverse: Athena enthroned left, holding Nike with wreath, transverse spear, resting hand on shield; BAΣIΛEΩΣ / ΛYΣIMAXOY // AΣ / KAΛXA
Ref: Marinescu 115 (O. 44 R. 104) issue ...
(5) Constantine I 325-326 AD
Obverse: laureate head right; CONSTAN_TINVS AVG
Reverse: Camp gate with 2 turrets and 8 layers, star above; PROVIDEN_TIAE AVGG / MNΓ
Ref: RIC VII Nicomedia 121
(6) Constantine II 337-340 A.D.
AE unit Nicomedia
Obverse: FL IVL CONSTANTIVS NOB C, laureate, draped, cuirassed bust right
Reverse: PROVIDEN-TIAE CAESS, campgate, 2 turrets, 7 layers, dots in top layer, star above, no doors.
Ref: RIC 158 var.
(7) Constantius II 348-351 A.D.
Obverse: D N CONSTANTIVS P F AVG, diademed, draped and cuirassed bust left, holding globe
Reverse: FEL TEMP-REPARATIO, Emperor bare headed and in military dress standing left, holding labarum in his right hand, resting left hand on shield. Two bound captives standing and leaning to the left before him.
Ref: RIC VIII 67
(8) Crispus 324 - 325 AD
Obverse: FL IVL CRIS-PVS NOB C: Bust of Crispus, laureate, draped, cuirassed, left
Reverse: PROVIDEN-TIAE CAESS: Camp gate with two turrets, without doors, with varying number of stone layers; star above. MintMark: -/-//SMNB
Ref: RIC VII Nicomedia 92
(9) Galerius 307-308 AD
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
Ref: RIC VI Nicomedia 51 var. (officina)
(10) Gordian III 238-244 AD
AE unit Nicaea
Obverse: radiate, draped and cuirassed bust right; M ANT_ΓOPΔIANOC AVΓ
Reverse: four standards, eagles on the middle two, wreaths on other two; N-I-K-A-I / EΩN
Ref: BMC 118, SNG Copenhagen 526
(11) Honorius AD 393-395
Obverse: DN ARCADIVS PF AVG, diademed, draped and cuirassed bust right
Reverse: GLORIA ROMANORVM. Arcadius in military attire on horseback pacing right, his right hand raised
Ref: Sear 20816ff
(12) Kios 325-300 BC
AE unit Kios
Obverse: head of Mithra right wearing peaked cap
Reverse: Kantharos with two grape vines within wreath of grain; A / K_I
Ref: SNG Copenhagen 382
(13) Licinius 313-317 AD
Obverse: IMP C VAL LICIN LICINIVS PF AVG Laurete head right
Reverse: IOVI CONS-ERVATORI Jupiter standing left, wearing chlamys (cloak) across left shoulder, holding Victory on globe left and eagle-tipped sceptre right, eagle with wreath in lower left field and N over G (Gamma) in right field. Exergue: SMN
Ref: RIC VII Nicomedia 15. RIC rarity: R...
(14) Licinius 313-317 AD
Obverse: laureate head right; IMP C VAL LICIN LICINIVS P F AVG
Reverse: Jupiter standing left, holding Victory and scepter; eagle to left; IOVI CONS_ERVATORI / Z / SMN
Ref: RIC VII Nicomedia 13
(15) Lysimachos 323-281 BC
Obverse: Diademed head of deified Alexander right, with horn of Ammon
Reverse: BAΣIΛEΩΣ ΛYΣIMAΧOY / Athena seated left, holding Nike and resting elbow on shield at side, spear leaning against far shoulder; ΔI in inner left field
Ref: None provided
(16) Maximinus II 310-311 AD
Obverse: IMP C GAL VAL MAXIMINUS PF AVG, Laureate bust right
Reverse: GENIO AVGVSTI CMH
Ref: RIC VI 66c
(17) Maximinus II 312 AD
Obverse: IMP C GAL VAL MAXIMINVS P F AVG, Head of Maximinus facing right, wearing laurel wreath
Reverse: SOLI INVICTO, Sol standing facing left in long robe, with raised right hand and holding up head of Serapis in left, star Γ to left, Mintmark SMN
Ref: RIC VI Nicomedia 77b
(18) Prusias II 182-149 BC
AE unit Bithynia
Obverse: Wreathed head of Dionysos right
Reverse: Centaur advancing right, playing lyre; monogram below raised foreleg
Ref: RG 26; SNG Copenhagen 639; HGC 7, 6...
(19) Septimius Severus 193-211 AD
AE unit Chalcedon
Obverse: draped and cuirassed bust right; AY K Λ CEΠ CEY(HP)OC Π
Reverse: Apollo holding patera and branch; KAΛXAΔO_NIΩN
Ref: obverse: SNG von Aulock 496, otherw...
(20) Septimius Severus 193-211 AD
AE unit Nicaea
Obverse: laureate head right; AV K Λ CEΠ_CEV(HP)OC ΠE
Reverse: eagle with wreath standing on fulmen between standsards; NIK_AI_EΩN
Ref: apparently unique - not in Rec Gen,...
(21) Severus Alexander 222-235 AD
AE unit Nicaea
Obverse: laureate, draped and cuirassed bust right from back; M AVP CEV AΛEZANΔPOC A(VΓ)
Reverse: three standards (○I●I●I); NI-K-AI-E / ΩN
Ref: RPC VI, 3202 (temporary); cf. Rec G...
(22) Valens 369 AD
Obverse: DN VALENS P F AVG, Bust of Valens facing right, wearing pearl diadem, cuirass, and drapery
Reverse: GLORIA REIPVBLICAE, Roma and Constantinople facing each other, each holding a scepter and together holding a shield inscribed VOT V MVLT X; SMNI in exergue
Ref: RIC IX 13b.2 var.
(23) Valentinian I 367-375 AD
Obverse: DN VALENTINIANVS P F AVG, Bust of Valentinian facing right, wearing pearl diadem, cuirass, and drapery
Reverse: RESTITVTOR REIPVBLICAE, Valentinian standing, looking right, in military dress, holding labarum and Victory on globe; SMNA in exergue
Ref: RIC IX 7a