The Skilled Artisans, Many Enslaved, Who Made Ancient Rome’s Most Luxurious Art Are Finally Getting Credit

Craftworkers may have used subtle logos to secretly advertise their workshops.

They carved glass so delicate one wrong move would shatter months of work. They engraved symbols into cups destined for emperors. They created objects so valuable that Romans paid to repair broken glass, something almost never done in the ancient world. Yet for nearly 2,000 years, the skilled craftworkers behind some of Rome’s most breathtaking artifacts remained anonymous, their contributions erased by a society that saw manual labor as beneath notice.

Now archaeologist Hallie G. Meredith from Washington State University has found evidence that these marginalized artisans (many of them enslaved or formerly enslaved) left their mark after all. Her research, published in World Archaeology, argues that late Roman engravers marked elite glass with workshop symbols. Specifically, visual logos rather than personal signatures.

The discovery sheds light on the lives of Roman artisans and their place in society.

Skilled Hands, Forgotten Names

Roman engravers occupied a paradox. Second- through fifth-century craftworkers who received training could command high prices if enslaved; their skills made them valuable property. Yet even highly trained artisans rarely got individual recognition. Roman culture celebrated patrons who commissioned artwork, not the hands that actually made it.

Meredith writes that the marginalization of Roman artists, both in antiquity and by scholars, has led to a fundamental gap in knowledge concerning agency, authorship, and creative manual labor.

Ancient written sources about craftworkers are scarce. No production manuals survive from engravers themselves. The closest documentation comes from business contracts about apprenticeships, funerary inscriptions, and the occasional satirical account like the 2nd-century sophist Lucian’s tale of a disillusioned sculptor’s first day on the job.

Legal texts, however, reveal something about how Romans viewed skilled engraving. Second-century Roman jurists used the term imperitia to distinguish between experienced engravers and inexperienced apprentices or assistants. When working with expensive materials, experienced engravers could refuse commissions that were too risky. The time dedicated to carved work was considered especially valuable because while everyday blown glass got recycled when broken, carved glass was worth repairing.

Repairs to Roman glass vessels are extraordinarily rare. Glass had almost no intrinsic value. The poet Martial joked about street vendors trading sulfur matches for broken glass shards. But the handful of repaired Roman glass pieces that do survive are all elaborately engraved. Someone decided the carving itself was worth more than the material.

Garbage Dumps Tell Us About Ancient Workshops

Meredith’s research relies on two types of evidence that earlier scholars overlooked: unfinished pieces abandoned mid-production and symbols carved onto completed works.

The unfinished pieces are especially revealing. Take the diatreta, also called “cage cups,” among the most technically demanding glass objects ever created. An artisan would start with a thick glass vessel, then laboriously carve away the outer layer to create an openwork design connected to the inner cup only by delicate horizontal glass bridges.

A few incomplete diatreta survive, probably discarded when something went wrong. These pieces preserve production stages that finished works erase. Initial gridlines etched into the glass surface show planning phases. Tool marks reveal carving techniques. These fragments capture craftworkers in the act of creation.

Even more telling is what happened to rare materials. Meredith discovered that a special type of glass called dichroic glass, which contains minute quantities of gold and silver and appears to change colors in different lighting, was selectively recycled among Roman engravers.

Originally used in 4th-century openwork vessels, this same rare glass later shows up in a completely different art form called opus sectile, cut-work wall panels. The dichroic glass was specifically chosen for flesh tones in these panels, a purposeful decision that shows engravers in different craft industries were sharing valuable materials within a limited professional network.

A garbage heap excavated at Palatine East in Rome contained bone and ivory fragments carved in identical ways. Engravers in different media worked side by side, possibly in domestic spaces. Another site at Kom el-Dikka in Alexandria, Egypt, likely divided rooms by material to facilitate recycling rather than keeping engravers physically separate by specialty.

A Glimpse Inside The Ancient Roman Workshop

The evidence points to Roman craft production being organized differently than scholars assumed. Instead of separate workshops divided by material (one for glass, another for bone, a third for ivory), some workshops brought together engravers who worked across multiple materials using similar carving techniques.

A bilingual sign from Palermo, Sicily, dated between the 1st century BCE and 2nd century CE, offers a rare glimpse into workshop organization. The stone-cutter’s advertisement distinguishes between those who “arrange” inscriptions and those who “incise” them. Different craftworkers with different skill levels handled different production stages.

These workshops probably mixed enslaved apprentices with freeborn master craftspeople. Some 4th-century images from villa mosaics and manuscripts show construction scenes with multiple workers whose age, dress, and scale suggest internal hierarchies and social rankings based largely on skill and experience.

Gold-glass vessel fragments provide another window into workshop collaboration. More than 500 of these survive, typically roundels with incised gold-leaf imagery and inscriptions sandwiched between two layers of decolorized glass. The artist who rendered images and inscriptions in gold leaf worked alongside craftworkers handling hot glass, since the etched gold was encased between two separate glass layers. This represents multiple production stages with interconnections between engravers in different media, possibly even the same engravers with more diverse skills than previously thought.

The Secret Logos Hidden on Imperial Glass

Meredith’s most important finding involves symbols that earlier researchers dismissed as mere decoration. On at least three nearly identical examples of carved glass vessels, an engraving of a diagonal line on a diamond shape is found, which Meredith argues is a maker’s mark for a workshop. These symbols appear alongside inscriptions mentioning emperors or elite figures, the engravers’ target audience.

Previous scholars, when they mentioned these symbols at all, characterized them only as decorative elements framing adjacent text. Meredith argues they’re actually workshop marks, a form of branding identifying collectives of makers.

Meredith explains that such marks served as public-facing advertising for the engravers.

In a society that theoretically dismissed manual laborers, skilled engravers marked high-end imperial commissions with their own symbols. They wanted contemporaneous viewers to know who made these masterpieces. The marks weren’t signatures of individual artists but rather logos for workshop collectives, perhaps even advertising an “industry” of related producers.

These symbols function as what Meredith calls “imagistic script,” a visualized, non-textual form of communication. Rather than spelling out names, the marks created visual identities that customers and patrons could recognize.

The emphasis on workshop collectives rather than individual craftworkers fits what evidence survives about Roman craft production. The rare contemporary images showing multiple workers (like a 4th-century gold-glass medallion depicting six craftworkers and possibly a patron engaged in ship building) emphasize group production and social differentiation.

A 4th-century construction scene from a villa mosaic at San Marco, Italy, shows various workers at different tasks. A 5th-century manuscript illustration depicts the Tower of Babel under construction with multiple laborers. A 5th-century synagogue mosaic from Huqoq, Israel, shows Biblical construction in progress with numerous workers. All these images emphasize collective production and economic and social hierarchies based on the scale, dress, and positioning of figures.

Roman craftworkers themselves left evidence pointing to their identity as members of workshops or trades rather than as individual artists. Various occupational titles survive in inscriptions, including diatretarii, often taken to mean glass engravers, though Meredith notes the term may have been used more broadly to cover craftspeople carving multiple materials through similar processes.

Meredith’s research addresses a century-old gap in scholarship about the ancient Roman economy. Heated academic debates about economic systems in antiquity have largely ignored the people actually making things.

Meredith writes that despite significant archaeological evidence concerning late Roman period craft production, little is known of the experience of craftworkers, their process or their interconnections, whether that refers to division of labor or the social hierarchies that existed within trades and individual workshops.

Her approach (studying unfinished artifacts, symbols on completed pieces, and recycled materials) shows production that was more intricate in terms of technique, economics, and social structure than previously understood. The interconnections between craftworkers, whether referring to division of labor or hierarchies within workshops, become visible through these overlooked types of evidence.

The late Roman period spans roughly the late 3rd through 6th centuries CE. During this era, the craftworker population included freeborn, enslaved, and manumitted laborers with various skill levels. The social importance given to engravers’ work (evidenced by repairs to carved glass, legal protections for experienced artisans, and the presence of workshop marks on imperial commissions) points to these craftworkers holding more status than their marginalized social positions would imply.

The Roman engravers who carved those diamond symbols into imperial glassware 1,700 years ago couldn’t sign their names. Ancient Roman society wouldn’t have allowed it. But they found another way to say “we made this,” a way that’s finally being understood.