Silver Tetradrachm of Nicomedes II Epiphanes, Kingdom of Bithynia

Historical Context

The Hellenistic Kingdom of Bithynia, positioned along the strategic maritime corridors of the Bosporus and Propontis in northwestern Anatolia, entered a critical phase of internal realignment and international diplomacy during the mid-second century BCE. In 149 BCE, Nicomedes II ascended the throne after leading a successful revolt against his father, Prusias II the Hunter. Prusias had earlier attempted to assassinate his son while Nicomedes was residing in Rome as a royal envoy. With decisive military support from King Attalos II of Pergamon and the diplomatic acquiescence of the Roman Senate, Nicomedes II deposed and executed his father at Nicomedia, assuming the throne alongside the divine royal epithet Epiphanes, signifying God Manifest or The Illustrious.

The introduction of a reformed royal silver tetradrachm served both as an instrument of state finance and as a primary medium for royal legitimation. Minted on the Attic weight standard, these tetradrachms integrated Bithynian royal trade into the wider economic spheres of the Aegean, Black Sea, and eastern Mediterranean, while facilitating the payment of standing mercenary forces. Nicomedes II established an iconographic and epigraphic paradigm that proved exceptionally durable: his royal title, the diademed royal portrait, and the standing Zeus reverse design remained the standard template for Bithynian royal coinage for over seven decades. Subsequent kings, including Nicomedes III Euergetes and Nicomedes IV Philopator, continued to strike tetradrachms retaining the name and likeness of Nicomedes II until the kingdom was formally bequeathed to the Roman Republic in 74 BCE.

Obverse Iconographic Composition

The obverse field is dominated by a dynamic, right-facing portrait head of King Nicomedes II rendered in the high relief characteristic of mature Hellenistic royal portraiture. The monarch is depicted clean-shaven and mature, displaying a commanding facial structure marked by an aquiline nose, a pronounced brow ridge, and firm jawline contours that synthesize idealized Hellenistic heroic conventions with distinct individual physiognomy.

Encircling the king's head is the royal diadem, the broad white textile band that served as the preeminent visual insignia of Hellenistic kingship following the conquests of Alexander the Great. The diadem's long fabric ties flutter naturally downward behind the nape of the neck. The king's hair is rendered in voluminous, deeply engraved curls that frame the forehead and temple, escaping from beneath the diadem in thick waves. The entire composition is surrounded by a delicate dotted die border, which sets off the high sculptural volume of the royal profile against the open flan.

Obverse Epigraphy and Inscriptions

The obverse die features no alphabetic legends, magistrates' signatures, or administrative control marks. In alignment with established royal Hellenistic numismatic traditions across Asia Minor, the obverse surface is reserved entirely for the ruler's portrait, leaving the presentation uncluttered by textual elements.

Reverse Iconographic Composition

The reverse depicts a monumental standing figure of Zeus facing left, draped in a himation that wraps around his left shoulder and lower limbs, leaving his muscular torso and chest bare. This representation is traditionally identified in Hellenistic numismatics as Zeus Stephanophoros (the wreath-bearer) or Zeus Stratios (Zeus of the army), reflecting divine patronal protection over the Bithynian dynasty.

In his outstretched right hand, Zeus holds a laurel wreath poised directly above the first word of the vertical royal legend on the right, symbolically bestowing divine victory and sovereign legitimacy upon the king. In his lowered left hand, Zeus grasps a tall vertical scepter that rests upon the exergual ground line. In the inner left field, situated between Zeus and the secondary vertical inscription, an eagle stands left atop a thunderbolt (keraunos), reinforcing the celestial power of the patron deity. Directly below this eagle and thunderbolt, the field accommodates variable control marks, including magistrates' monogram ligatures and dated Greek numerals indicating the emission year according to the Bithynian Era.

The reverse composition is an open field without an enclosing outer border of oak or laurel leaves; the wreath is held strictly as an attribute within Zeus's right hand.

Reverse Epigraphy and Inscriptions

The reverse features a formal royal Greek inscription arranged in two parallel vertical columns flanking the central figure of Zeus:

ΒΑΣΙΛΕΩΣ ΕΠΙΦΑΝΟΥΣ ΝΙΚΟΜΗΔΟΥ

Transliteration: BASILEŌS EPIPHANOUS NIKOMĒDOU

Translation: "Of King Nicomedes Epiphanes" (rendered in Cleveland Museum of Art records as "Of the distinguished king Nikomedes").

The title ΒΑΣΙΛΕΩΣ occupies the right vertical field, reading downward to the right of Zeus's scepter. The king's epithet and name, ΕΠΙΦΑΝΟΥΣ ΝΙΚΟΜΗΔΟΥ, occupy the left vertical field, running downward to the left of the eagle and thunderbolt. The letterforms are standard late Hellenistic lapidary capitals with neat, unobtrusive apices.

Administrative inscriptions on the reverse are located in the inner left field below the eagle on thunderbolt, consisting of combined monogram ligatures representing supervisory mint officials and numerical letters denoting the calendar year reckoned by the Bithynian dynastic era.

Typology and Documented Variants

The diademed portrait and standing Zeus with royal titulature belong to the Nicomedes Epiphanes tetradrachm tradition. Related issues vary in date letters, ligatures and small symbols, and the dynasty continued similar designs beyond Nicomedes II's lifetime. Exact era-year reading is necessary before assigning a narrower emission.

CMA 1917.990 is catalogued as Nicomedes II, dated 149-120 BCE, with 35 mm and 9.137 g. The mass is substantially below a usual Attic tetradrachm standard. It is retained as reported institutional data, not corrected to a theoretical value or described as an independently measured weight.

Scholarly Debates and Attribution Limitations

Issuer and Date

The museum attribution is Nicomedes II, while comparable dynastic designs continued under later rulers. The museum date is not the full reign of Nicomedes II, and no readable era-year is certified here.

Mint

Bithynia is the institutional issuing context. Assignment to Nicomedia is a comparison hypothesis unless supported by a checked type; the royal name does not itself name the mint.

Reported Mass

The 9.137 g figure differs markedly from a normal tetradrachm standard. The record alone does not establish a clerical error, metal loss, electrotype or replica. Curatorial confirmation is needed to explain the discrepancy. No substitute mass is supplied.

References

1. The Cleveland Museum of Art: Collection Record 1917.990 (Tetradrachm: Head of Nicomedes II / Zeus, eagle). Accession 1917.990 (sub-records 1917.990.a and 1917.990.b)