Gallienus Zoo Series Coins: Animals, Gods & Officina Marks
Among the most distinctive Roman coin series of the third century is the so-called Zoo Series of Gallienus: antoniniani showing real and mythical creatures paired with appeals to gods as protectors of the emperor.
For collectors, the series offers something unusual—a defined group of coins with recognizable animals, deity legends, mint-workshop marks, and enough variety to build anything from a small representative set to a serious specialist collection.
Gallienus and the Crisis of the Third Century
Gallienus ruled jointly with his father Valerian from AD 253 and then alone after Valerian’s capture by the Sasanians in AD 260. His sole reign unfolded amid invasions, rebellions, breakaway regimes, plague, and severe monetary disruption.
The Zoo Series belongs near the end of Gallienus’ reign, conventionally dated around AD 267–268. The best-known series was struck at Rome, with a related and much smaller series also known from Siscia.
What Does CONS AVG Mean?
The reverse legends pair a deity with CONS AVG, an abbreviated appeal to that god or goddess as protector or preserver of the emperor. That formula is the key to understanding the series.
The animals are not simply generic symbols for strength, speed, or renewal. They belong to specific divine associations expressed by legends such as DIANAE CONS AVG, APOLLINI CONS AVG, IOVI CONS AVG, and SOLI CONS AVG.
The Main Deities and Creatures
The Rome-mint Zoo Series includes the following major deity-and-creature groups. Individual varieties can differ in direction, pose, bust type, legend, and officina.
Diana
DIANAE CONS AVG types include several deer- or antelope-like animals, commonly described by collectors as antelope, doe, stag, and gazelle. These are among the most frequently encountered Zoo coins.
Apollo
APOLLINI CONS AVG issues include mythical creatures such as the centaur and griffin. Centaurs appear in multiple poses and with different attributes.
Jupiter
IOVI CONS AVG is associated principally with a goat. The officina mark is an important part of attributing these coins.
Sol
SOLI CONS AVG types include a winged horse, usually catalogued as Pegasus, and the bull. “Pegasus” is the familiar collecting name, although some specialists have questioned whether the winged horse represents Pegasus specifically rather than a horse associated with Sol.
Neptune
NEPTVNO CONS AVG issues include marine hybrids such as the hippocamp and Capricorn.
Liber Pater
LIBERO P CONS AVG is associated with a large feline generally described as a panther, though specialist references can use other feline identifications.
Hercules
The scarce HERCVLI CONS AVG issues show the lion and boar, creatures connected with the heroic mythology of Hercules. These are much harder to obtain than the common Diana types.
Mercury
Very rare MERCVRIO CONS AVG issues are associated with a fantastic marine creature usually described as a criocamp or related hippocamp type.
What About Juno?
The broader Zoo coinage also includes issues for Gallienus’ wife Salonina. Her IVNONI CONS AVG reverses pair Juno with a deer- or antelope-like creature. Collectors building a broader imperial-couple Zoo set may include these alongside Gallienus’ coins.
Coins That Do Not Belong in the Zoo Series
Animal imagery by itself does not make a coin part of Gallienus’ Zoo Series. A Roman she-wolf-and-twins reverse, for example, is not automatically a Zoo coin. The recognized series is defined by its CONS AVG deity legends, issue structure, and related mint marks—not merely by the presence of an animal.
Likewise, an elephant of Jupiter should not be placed on the standard Zoo checklist. That identification appeared in an earlier version of this guide but does not belong among the recognized core types.
The Officina Marks: The Hidden Structure of the Zoo
One of the most interesting features of the Rome series is its relationship with the mint’s workshops, or officinae. Marks in the exergue can use Greek letters for the early workshops and numerals for later ones. Particular deity-and-animal types are strongly associated with particular officinae.
The standard Rome framework most strongly associates Sol’s winged horse with officina 1, Liber’s panther or tigress with 2, Diana’s antelope with 3, Apollo’s griffin with 4, Diana’s doe with 5, Jupiter’s goat with 6, Apollo’s centaurs with 7–8, Neptune’s hippocamp with 9, Diana’s stag with 10, and Diana’s gazelle with 11–12. Secondary and unusual varieties exist—including Sol winged-horse pieces with other workshop marks—so the mintmark should be checked against a specialist reference rather than used as a one-step attribution rule.
Other secondary combinations help explain why advanced collectors can take the series much further: Hercules’ lion is associated with officina 1, Juno’s animal with 4, Hercules’ boar with 5, Neptune’s Capricorn with 6, Mercury’s criocamp with 8, and Sol’s bull with 11.
A Practical Beginner Checklist
You do not need every known variety to enjoy the series. A strong beginner set could start with six representative coins:
- Diana — antelope, doe, stag, or gazelle
- Apollo — centaur or griffin
- Jupiter — goat
- Sol — winged horse/Pegasus or bull
- Neptune — hippocamp or Capricorn
- Liber Pater — panther
From there, add different animal varieties, officinae, directions, and bust types. Advanced collectors can pursue the scarce Hercules types, the extremely rare Mercury issue, Salonina’s Juno coinage, and the related Siscia material.
What Do Zoo Coins Cost?
There is no useful permanent price chart. Common Diana, Apollo, Jupiter, Sol, Neptune, and Liber types can often be approachable, while rarity, condition, centering, silvering, portrait quality, animal clarity, officina, and exact variety can change value substantially.
Scarce Hercules and Mercury types occupy a very different market from common Diana issues, so comparing all Zoo coins by one fixed price range is misleading.
What Should a Beginner Look For?
For a first Zoo coin, prioritize a readable deity legend, identifiable creature, visible officina mark if possible, and natural surfaces. A coin does not need to be perfectly centered or retain complete silvering to be a satisfying example.
More importantly, learn to attribute the combination of legend + creature + officina. That is where the series becomes more than a group of animal pictures.
Why the Zoo Series Is Such a Good Collection
The Zoo Series gives a beginner several skills at once. You learn Roman religious formulas, mint organization, officina marks, late antoninianus fabric, portrait varieties, mythology, and the realities of collecting coins produced during the Crisis of the Third Century.
It is also a series where a modest collection can feel complete on its own terms. Six representative deity groups make a coherent display, while a specialist can spend years pursuing variants.
Frequently Asked Questions
What is Gallienus’ Zoo Series?
It is a late-reign group of antoniniani that pair real or mythical creatures with deities invoked as protectors of Gallienus.
When was the Zoo Series struck?
The principal Rome series is conventionally dated around AD 267–268, near the end of Gallienus’ reign.
What is an easy Zoo coin for a beginner?
Diana animal types are among the most frequently encountered and make an excellent starting point.
Is every Roman coin with an animal part of the Zoo Series?
No. The series is identified by its specific deity legends, CONS AVG formula, issue structure, and mint marks—not simply by an animal reverse.
Final Thought
Gallienus’ Zoo coins are memorable because they are visually unusual, but their real interest lies in their structure. Each creature belongs within an appeal to divine protection, and the mint workshops help organize the series into something collectors can study rather than simply accumulate.
Start with one common Diana, Apollo, Jupiter, Sol, Neptune, or Liber type. Read the legend. Identify the animal. Find the officina. Then build your zoo from there.