How to Read Roman Coins: Legends, Portraits, Reverses & Mint Marks

Most Roman imperial coins can be decoded by working through the same basic clues: the portrait or bust, the obverse legend, the reverse type and legend, the denomination and metal, and—on many later coins—the mint mark and officina. The abbreviations look difficult at first, but the same titles repeat so often that a small vocabulary opens up a large part of the series.

Roman coinage changed enormously between the Republic and Late Empire, so no single rule applies to every coin. Not every Roman coin has an emperor on the obverse, not every reverse is propaganda in a simple sense, and mint marks are especially useful only in certain periods. The method below is designed as a practical starting point for imperial coins.

1. Identify the Obverse and Reverse

The obverse is usually the principal side and, on imperial coinage, commonly carries the emperor, empress, Caesar or another member of the ruling house. The reverse usually carries a deity, personification, military scene, building, animal, standard, captive, ceremonial object or other design accompanied by a legend.

Portraits are useful clues, but they should be combined with inscriptions. Hair, beard, diadem, laurel wreath, radiate crown, helmet, cuirass and drapery can all help distinguish rulers and denominations.

2. Read the Imperial Legend

Roman legends compress names and titles into abbreviated Latin. Read around the coin and separate familiar title groups rather than trying to translate every letter at once.

Common Roman Coin Abbreviations

IMP — Imperator. Originally an acclamation for a victorious commander and later a regular part of imperial titulature.

CAES — Caesar. Julius Caesar's family name became part of imperial titulature and, especially in the later imperial system, often marked a junior ruler or designated heir. Its meaning depends on period and context.

AVG — Augustus. The principal imperial title adopted after Augustus. It can appear for one or more reigning Augusti and should not simply be translated as “senior emperor” in every period.

TR P / TR POT — Tribunicia Potestas. Tribunician power. On many early and high-imperial issues it is numbered and can be extremely useful for dating, because successive renewals correspond to specific years of a reign.

COS — Consul. Often followed by a numeral showing which consulship the ruler held.

P P — Pater Patriae. “Father of the Fatherland,” an honorific that emperors accepted at different points in their reigns.

P F — Pius Felix. “Pious, fortunate,” common in later imperial titulature.

D N — Dominus Noster. “Our Lord,” especially common in Late Roman obverse legends.

S C — Senatus Consulto. Conventionally understood as “by decree of the Senate.” It appears prominently on many early imperial base-metal issues, though the exact institutional role behind the formula changed over time.

A Simple Dating Example

Suppose an early imperial reverse legend includes TR P followed by a numeral and COS followed by another numeral. Those numbered titles can often be matched to a ruler's known sequence of tribunician powers and consulships, narrowing the coin to a particular year or short date range. This method is especially useful for rulers such as Trajan, Hadrian and Antoninus Pius. It is less useful on many Late Roman coins, where titulature follows different conventions.

3. Decode the Reverse

The reverse identifies the message or subject of the issue. Common legends include:

PAX / PAX AVG — Pax, the personification of peace, often shown with branch, scepter or other attributes.

VICTORIA AVG / AVGG — imperial or Augustan Victory. The exact ending matters because legends can refer to one Augustus or multiple Augusti.

GLORIA EXERCITVS — “Glory of the Army,” familiar on fourth-century bronzes showing soldiers and standards.

FEL TEMP REPARATIO — conventionally translated “Restoration of Happy Times,” used for a major mid-fourth-century series under Constantius II and Constans with several different reverse designs.

IVDAEA CAPTA and related Judaea victory legends — part of the Flavian coinage commemorating Roman victory in the Jewish Revolt. The wider series uses several legends and designs, including captives, trophies, Victory and personifications of Judaea; not every Judaea Capta coin shows the same palm-tree scene.

When identifying a reverse figure, look at attributes: a cornucopia, spear, patera, rudder, caduceus, scales or thunderbolt may distinguish one deity or personification from another.

4. Look at the Exergue, Mint Mark and Officina

The exergue is the space beneath the main reverse design, often separated by a ground line. On many Late Roman coins it contains the mint signature and workshop mark.

Mint marks are issue-specific rather than universal abbreviations. For example, forms beginning SMANT can identify Antioch on certain Late Roman issues; PTR can identify Trier with the P indicating the first officina in a particular system; forms beginning CON or CONS can identify Constantinople; and forms beginning SIS can identify Siscia. The exact letters, prefixes, suffixes and workshop marks vary by reform, emperor and issue.

An officina was a workshop within a mint. Workshops may be marked with Greek letters, Latin letters, numerals or other symbols. Never identify an officina from a single letter without checking the exact coin series, because the same mark can mean different things in different mint systems.

5. Identify the Denomination and Period

Denarius: introduced during the Roman Republic and the principal silver denomination for centuries. It remained important through the early third century before the antoninianus increasingly displaced it.

Sestertius: a large brass or bronze denomination especially familiar from the early Empire. Its broad flan allowed detailed portraits and reverse scenes.

Antoninianus: introduced under Caracalla in AD 215. Male rulers normally wear a radiate crown and female portraits commonly appear above a crescent. Its silver content fell dramatically during the third century.

Nummus / “follis”: Diocletian's reform introduced a large silvered copper-alloy coin conventionally called a follis by collectors, though its ancient name is uncertain. Later fourth-century bronzes became much smaller and should not all be treated as the same denomination simply because older catalogues sometimes use “follis” loosely.

Aureus and solidus: the aureus was the principal imperial gold denomination for much of the early Empire; the solidus, introduced in a stable form under Constantine, became the dominant Late Roman gold coin.

Roman provincial coinage: not a denomination at all, but a broad category of locally issued coinage under Roman rule. Provincials include bronzes, drachms, tetradrachms and many other local denominations.

A Five-Step Roman Coin Identification Method

1. Read as much of the obverse name and titles as possible.
2. Compare the portrait and bust type with likely rulers.
3. Identify the reverse figure, scene and surviving legend.
4. Check metal, size and denomination.
5. For Late Roman issues, read the exergue and field marks to identify mint and officina, then verify the complete combination in a reference.

Frequently Asked Questions

What does AVG mean on a Roman coin?

AVG abbreviates Augustus, the central imperial title. Its grammatical and political meaning depends on the complete legend and period.

What does IMP mean?

IMP abbreviates Imperator, a title rooted in military command and victory that became part of imperial titulature.

What is the exergue?

The exergue is the lower area of the reverse beneath the main design. On many Late Roman coins it contains a mint mark or other control information.

Can Roman coin legends date a coin?

Yes. Numbered tribunician powers, consulships and other titles can date many early imperial coins closely. Later coins are often dated instead through mint marks, issue sequences, ruler combinations and specialist catalogues.

Are all Roman mint marks the same format?

No. Mint signatures and officina systems changed repeatedly, so the entire mark must be interpreted within its specific issue.

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