A chance discovery of a broken bronze cup in Spain has revealed a 1,900-year-old depiction of Hadrian's Wall and forts in England, a new study reports. The multicolored vessel was likely crafted as a memento of a soldier's time defending the frontiers of the Roman Empire, the study authors said.

The cup was discovered in Berlanga de Duero, a municipality in central Spain, nearly 1,200 miles (2,000 kilometers) from the storied Roman defensive wall that protected the northern frontier of the empire in the second century. The hemispheric "Berlanga Cup" is about 4.5 inches (11.4 centimeters) wide and around 3.2 inches (8.1 cm) tall. It features colorful enameled designs and a Latin inscription that mentions four forts.

"The cup is a small representation of a functional vessel called a Roman trulla — a bronze or clay cup with a handle used to drink water," Jesús García Sánchez, an archaeologist at the Archaeological Institute of Mérida in Spain and co-author of the new study, told Live Science in an email. "It is not only crafted with metals, but also expensive enamels, and later on customized. It is definitely not an industrial product."

In the study, published April 23 in the journal Britannia, García Sánchez and colleagues wrote that, while similar cups have been discovered in the past, the Berlanga Cup is the only one that refers to forts on the eastern side of Hadrian's Wall. The four forts mentioned in the inscription are Cilurnum (now called Chesters), Onno (now called Halton Chesters), Vindobala (now called Rudchester), and Condercom (now called Benwell). Each fort is depicted on the cup as a series of four squares and two half-moons that represent either turrets or the fort's gateway. Below the schematic forts are two bands of designs inset with red, green, turquoise and navy-blue enamel.

An analysis of the cup revealed it was bronze — largely copper and tin — with a substantial addition of lead that likely came from mines in northernEngland. These findings strongly suggest the cup was made by a local artisan near Hadrian's Wall between A.D. 124 and 199, the researchers said. But how the cup ended up in Spain is a bit of a mystery.

The modern municipality of Berlanga de Duero was likely the ancient settlement of Valeranica in Roman times. Archaeological excavation in the area revealed fragments of Roman pottery and masonry walls, which were potentially part of a rural villa used between the first and fourth centuries. The Berlanga Cup may have been acquired by someone who lived in Valeranica and was a soldier in a Roman auxiliary unit of Hispanic origin known in historical records as the Cohors I Celtiberorum.

"This contingent was made up of troops from Celtiberia, precisely the area where the piece in question was found," the researchers wrote in the study, and "was stationed near Hadrian's Wall during the reign of Emperor Trajan" (who ruled from A.D. 98 to 117). After soldiers served in the Roman military, many returned to their original homes and brought back mementos of their time in service.

The Berlanga Cup "could have been a souvenir acquired by a veteran before his return home, purchased with the aim of remembering his time and service at one of the monumental forts of the Empire," the researchers wrote. Alternatively, the cup may have been bestowed on a soldier as recognition of distinguished service or a particularly brave act.

Either way, the fact that the memento was shaped like a simple trulla — an object soldiers used every day for eating and drinking — and not like a weapon suggests it was meant to remind veterans of the camaraderie they experienced while living along Hadrian's Wall, the researchers wrote.

What do you know about the Empire's conquest of the British Isles? Find out with our Roman Britain quiz!

Kristina Killgrove is a staff writer at Live Science with a focus on archaeology and paleoanthropology news. Her articles have also appeared in venues such as Forbes, Smithsonian, and Mental Floss. Kristina holds a Ph.D. in biological anthropology and an M.A. in classical archaeology from the University of North Carolina, as well as a B.A. in Latin from the University of Virginia, and she was formerly a university professor and researcher. She has received awards from the Society for American Archaeology and the American Anthropological Association for her science writing.