A laboratory study of a Roman Republican shipwreck off the Croatian island of Ilovik has turned a routine conservation question into a fresh clue about ancient shipyards and trade routes. Researchers working on the Ilovik–Paržine 1 wreck examined 10 fragments of the ship’s hull coating and found layered repair work that appears to span several maintenance episodes. The findings matter now because they connect a vessel likely built in southern Italy with repair materials that may track later stops in Greek-speaking ports.
Why A 2,200-year-old Roman shipwreck off Croatia revealed matters now
The Ilovik–Paržine 1 wreck is identified as a Roman Republican ship, and ballast analysis links its construction to Brundisium, the port known today as Brindisi in Italy, according to a provenance study of the ballast stones from the site that argues the material “strongly suggests” a Brundisium origin for the hull construction based on stone sourcing. That anchors the vessel on the western side of the Adriatic at the start of its life. The new coatings research shifts attention to what happened after launch, by tracing how and where the ship was maintained.
In the latest materials study, scientists analyzed 10 samples of hull coating from Ilovik–Paržine 1 using a mix of molecular and microscopic techniques, including FTIR spectroscopy, GC-MS and palynology, which is pollen analysis, according to the peer-reviewed work on adhesive coatings from the wreck published in Frontiers in Materials. The authors report that the coatings record multiple distinct application and repair episodes rather than a single protective layer. That pattern suggests the ship stayed in service long enough to need repeated interventions, likely in different harbors.
One of the coating mixtures consists of pine tar or pitch blended with beeswax, according to the same analysis of the Ilovik–Paržine 1 samples that identifies this combination in at least one layer on the hull surface in the study’s PDF. Because pollen grains can survive inside beeswax, the team used palynology to look for botanical fingerprints. The working hypothesis is straightforward: if pollen trapped in the beeswax matches profiles typical of Greek coastal apiaries rather than Italian ones, then at least one repair episode likely took place in a Greek-speaking port after the ship left Brundisium.
That question matters beyond this single wreck. If the beeswax points east, it would give material proof that ship maintenance, not only cargo, moved across cultural zones in the Adriatic. It would also show that technical know-how, such as preferred mixtures of pine tar and wax, circulated between Roman and Greek shipyards instead of staying confined to one side of the sea.
The evidence behind A 2,200-year-old Roman shipwreck off Croatia revealed
The coatings study on Ilovik–Paržine 1 is built around 10 hull-coating samples that were taken from the wreck site near Croatia, according to the adhesive materials research that specifies this sample count and location as the core dataset for its analysis of Roman Republican naval coatings through its DOI record. Each fragment was treated as a stratigraphic slice of the ship’s maintenance history, with the aim of separating original construction layers from later repairs.
To identify the substances in those coatings, the team relied on molecular methods, including FTIR and GC-MS, as described in the same study that lists these techniques as central tools for characterizing the organic components in the Ilovik–Paržine 1 samples within the Frontiers publishing platform. FTIR helped detect functional groups associated with resins, tars and waxes, while GC-MS provided more detailed molecular fingerprints. Together, these methods allowed the researchers to distinguish pine-derived tar or pitch from beeswax and other organic binders in the sample set.
Palynology added a different line of evidence. The coatings paper states that pollen analysis was applied to the hull samples to extract grains preserved in the organic matrix of the coatings, especially in beeswax-rich layers, using standard palynological procedures for archaeological materials as referenced in Frontiers’ discussion resources. Because pollen assemblages reflect local vegetation where bees foraged, they can in principle differentiate between wax produced near Italian versus Greek coasts, although the current publication focuses on method and presence rather than final geographic assignments.
The same materials study reports multiple distinct coating and repair episodes on the Ilovik–Paržine 1 hull, based on differences in composition and layering across the 10 samples, according to its description of stratified coatings that separate original build layers from later interventions in Frontiers’ press resources. Some layers contain primarily pine tar or pitch, while at least one shows a deliberate mixture of pine tar or pitch with beeswax, which the authors interpret as a tailored protective or sealing recipe rather than accidental contamination.
Earlier research on the same wreck examined the ballast stones carried by Ilovik–Paržine 1 and concluded that their geological signatures strongly point to a construction site in or around Brundisium, now Brindisi in Italy, according to the ballast provenance study that links specific stone types to quarries near that port and frames this as a hypothesis about the ship’s place of construction cited through Frontiers-related channels. That ballast work does not address coatings or repairs directly, but it anchors the origin of the hull in a Roman-controlled shipbuilding center on the Italian side of the Adriatic.
Taken together, the coatings and ballast studies show a ship that started life near Brundisium and later received repeated maintenance, with at least one repair episode involving a pine tar or pitch and beeswax mixture identified in the hull coatings, according to the combined evidence from adhesive analysis and stone provenance for Ilovik–Paržine 1 as reported in the coatings paper. The palynological data embedded in that beeswax now becomes a key test for whether those repairs happened in Italian yards, Greek-speaking ports, or a mix of both.
What remains unresolved for A 2,200-year-old Roman shipwreck off Croatia revealed
Several important questions remain open. The coatings study confirms that palynology was applied to the 10 hull samples and that multiple coating episodes exist, but it does not publish raw pollen-count tables or assign the beeswax layers to specific modern regions, according to the available summary of pollen work on Ilovik–Paržine 1 in the Frontiers PDF. Without that detailed comparison, the hypothesis about Greek coastal apiaries versus Italian ones remains untested in the public record.
There is also limited information on where exactly each of the 10 coating samples was taken within the hull structure. The coatings paper notes the number of samples and reports multiple distinct episodes, but it does not provide full excavation logs or precise in situ coordinates for every fragment, according to the description of the Ilovik–Paržine 1 material set in the adhesive coatings study hosted by the Frontiers partnership site. That gap makes it harder for outside specialists to assess whether certain repairs were concentrated near the keel, along the waterline, or around specific damage points that might hint at particular sailing routes or accidents.
On the management side, the coatings research acknowledges support from the Croatian Ministry of Culture, but publicly available material does not include direct statements from the ministry on long-term conservation plans or limits on further sampling at Ilovik–Paržine 1, based on the acknowledgements section of the Frontiers publication for the adhesive coatings study. That leaves open how much additional material analysis will be permitted and whether future campaigns will target more beeswax-rich layers for refined pollen work.
The ballast provenance study offers a strong case for construction in or near Brundisium, but it remains a hypothesis rather than a definitive legal finding, according to its own framing of the Brundisium link as a hypothesis about the ship’s place of construction based on stone sourcing in the ballast research. The coatings evidence does not contradict that origin story, yet it also does not resolve where along the ship’s career the later repair episodes took place.
For readers, the practical takeaway is that scientists are now using tools such as FTIR, GC-MS and pollen analysis not just to conserve ancient ships, but to track how shipbuilding and maintenance moved across the Adriatic. The next key development to watch will be any publication that breaks out detailed pollen profiles from the beeswax-rich layers on Ilovik–Paržine 1 and compares them with modern reference collections from Italian and Greek coasts. If those data align clearly with one shoreline, they will turn a set of microscopic grains into direct evidence of where a Roman Republican ship once limped into port for repairs.
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*This article was researched with the help of AI, with human editors creating the final content.
