Level 1 — Absolute Beginner

Ptolemais is a very old city in Libya, in North Africa. It was built more than 2,000 years ago by the ancient Greeks.

The city has a big stone gate called the Tauchira Gate. It is the best-preserved part of the city's old walls.

The workers who built the gate carved small marks into the stones long ago. There are 626 of these marks.

A scientist named Anna Urszula Kordas studied the marks using photos and computer software. She found the marks tell us how the gate was built and paid for.

ancient

very old, from a long time ago in history

stonemason

a person who builds or shapes things using stone

gate

a large opening in a wall that can be closed

carve

to cut a shape or mark into a hard material

preserved

kept in good condition over a long time

software

computer programs used to do a task

reign

the period of time when a king or ruler was in power

finance

money used to pay for something, or the management of that money

Level 2 — Elementary

University of Warsaw archaeologist Anna Urszula Kordas has decoded hundreds of stonemasons' symbols carved into the Tauchira Gate at Ptolemais, an ancient Greek city on the coast of Cyrenaica in eastern Libya. By carefully analyzing photographs and using digital mapping software, Kordas organized the 626 inscriptions into two major groups.

The Tauchira Gate is considered the best-preserved part of the fortifications that once surrounded Ptolemais, a city founded on the North African coast during the Hellenistic period. For centuries, travelers and scholars visiting the site noticed the small carved marks, but the symbols were rarely studied in close detail until Kordas took on the project.

Her analysis concluded that the gate was likely constructed during the reign of Ptolemy VIII, in the second century BC, giving researchers a new and more specific date for its construction. The marks also revealed a system of building organization and financing that was far more complex than historians had previously assumed.

Each mark, scholars believe, likely identified the individual stonemason or work crew responsible for cutting a particular stone block, functioning much like a signature or a record for payment. By mapping how these marks were distributed across the gate's two towers, Kordas was able to reconstruct patterns in how labor was assigned and tracked during construction.

archaeologist

a scientist who studies human history through physical remains and sites

fortification

a structure built to defend a place, such as a wall or gate

Hellenistic period

the era of Greek history and culture following Alexander the Great, before Roman rule

inscription

words or symbols carved or written onto a surface

scholar

a person who studies a subject deeply and seriously, often academically

construction

the process of building something

work crew

a group of workers assigned to complete a task together

reconstruct

to build up an understanding of something from available evidence

Level 3 — Intermediate

University of Warsaw archaeologist Anna Urszula Kordas has completed a systematic decoding of 626 stonemasons' marks inscribed on the towers of the Tauchira Gate at Ptolemais, a Hellenistic-era Greek city founded along the Cyrenaican coast of eastern Libya. Drawing on high-resolution photography and digital mapping software, Kordas classified the inscriptions into two principal categories, an analytical framework that had eluded prior researchers who examined the gate largely in passing.

The Tauchira Gate stands as the best-preserved element of Ptolemais's ancient defensive circuit, and its marks had attracted the attention of travelers and scholars for generations without becoming the subject of rigorous, systematic study. Kordas's methodology, treating the marks not as decorative curiosities but as a structured dataset, allowed her to draw conclusions about both the gate's chronology and the logistics behind its construction.

Her findings place the gate's construction during the reign of Ptolemy VIII in the second century BC, refining previous, less precise dating estimates for the structure. More significantly, the distribution and variety of the marks point to a construction-organization system considerably more sophisticated than historians had previously credited to Hellenistic-era public works, suggesting formalized methods for tracking individual stonemasons' or work crews' contributions, likely tied to compensation or accountability.

This kind of epigraphic evidence, easily overlooked because it lacks the narrative content of formal inscriptions or monumental texts, offers archaeologists a rare, granular window into the organizational and economic mechanics of ancient construction projects, information that formal historical records from the period rarely preserve. Kordas's work suggests that similarly marked structures elsewhere in the ancient Mediterranean may reward the same kind of systematic re-examination.

systematic

done according to a fixed, organized plan or method

classify

to arrange or sort things into categories based on shared features

defensive circuit

the complete ring of walls and fortifications protecting a settlement

rigorous

thorough, careful, and precise in method

chronology

the arrangement of events or dates in the order they occurred

logistics

the detailed coordination of a complex operation involving people and resources

epigraphic

relating to inscriptions carved or written on hard surfaces

granular

detailed at a very fine, specific level

Level 4 — Advanced

Anna Urszula Kordas's systematic decoding of the 626 stonemasons' marks inscribed on the Tauchira Gate at Ptolemais reframes what had long been treated as an incidental curiosity of the Cyrenaican Hellenistic city's best-preserved fortification into a structured dataset capable of yielding both a refined chronology and unprecedented insight into ancient construction logistics. By subjecting high-resolution photographic documentation to digital mapping analysis, Kordas classified the inscriptions into two principal typological categories, an analytical rigor that generations of travelers and scholars, who noted the marks' existence without subjecting them to close study, had never applied.

The resulting chronological refinement, dating the gate's construction to the reign of Ptolemy VIII in the second century BC, is notable less for its precision alone than for what it implies about the reliability of epigraphic micro-evidence as a dating tool independent of, and potentially more granular than, the monumental inscriptions and literary sources historians have traditionally privileged. That such an unassuming category of evidence, individual masons' marks rather than formal dedicatory texts, can anchor a structure's chronology underscores how much dating precision has historically been left on the table in sites where systematic mark analysis was never attempted.

More consequential still is what the marks' distribution reveals about the underlying logistics of Hellenistic public works: a construction-organization and compensation-tracking system considerably more formalized than historians had previously attributed to the period's civic building projects. This finding complicates a historiographical tendency to treat ancient monumental construction primarily through the lens of royal patronage and architectural design, foregrounding instead the largely invisible administrative apparatus, tracking individual laborers' or crews' contributions across potentially years-long projects, that made such construction achievable at scale.

Kordas's approach implicitly issues a methodological challenge to the broader field: comparable masons' marks likely survive, understudied, on fortifications and public structures across the Hellenistic and Roman Mediterranean, and her demonstration that systematic digital analysis can extract chronological and organizational data from evidence long dismissed as marginal suggests that a meaningful body of archaeological knowledge may remain recoverable not through new excavation, but through the rigorous re-examination of structures and inscriptions already fully exposed to view.

typological

relating to the classification of things according to shared type or characteristics

micro-evidence

small-scale physical evidence that individually seems minor but can be analytically significant

dedicatory text

an inscription formally commemorating or dedicating a structure or object