AI Helps Decipher Ancient Roman text

There are around 1,500 Latin inscriptions that are discovered every year, offering an invaluable view into the daily life of ancient Romans -- and posing a daunting challenge for the historians tasked with interpreting them.

But a new artificial intelligence tool, partly developed by Google researchers, can now help Latin scholars piece together these puzzles from the past, according to a study published last 23 July.

Inscriptions in Latin were commonplace across the Roman world, from laying out the decrees of emperors to graffiti on the city streets. One mosaic outside a home in the ancient city of Pompeii even warns: "Beware of the dog".

These inscriptions are "so precious to historians because they offer first-hand evidence of ancient thought, language, society and history", said study co-author Yannis Assael, a researcher at Google's AI lab DeepMind.

"What makes them unique is that they are written by the ancient people themselves across all social classes on any subject. It's not just history written by the elite," Assael, who co-designed the AI model, told a press conference.

However these texts have often been damaged over the millennia.

"We usually don't know where and when they were written," Assael said.

So the researchers created a generative neural network, which is an AI tool that can be trained to identify complex relationships between types of data.

They named their model Aeneas, after the Trojan hero and son of the Greek goddess Aphrodite.

It was trained on data about the dates, locations and meanings of Latin transcriptions from an empire that spanned five million square kilometres over two millennia.

Thea Sommerschield, an epigrapher at the University of Nottingham who co-designed the AI model, said that "studying history through inscriptions is like solving a gigantic jigsaw puzzle".

"You can't solve the puzzle with a single isolated piece, even though you know information like its colour or its shape," she explained.

"To solve the puzzle, you need to use that information to find the pieces that connect to it."

Latin scholars have to compare inscriptions against "potentially hundreds of parallels", a task which "demands extraordinary erudition" and "laborious manual searches" through massive library and museum collections, the study in the journal Nature said.

The researchers trained their model on 176,861 inscriptions -- worth up to 16 million characters -- five percent of which contained images.

It can now estimate the location of an inscription among the 62 Roman provinces, offer a decade when it was produced and even guess what missing sections might have contained, they said.

To test their model, the team asked Aeneas to analyse a famous inscription called "Res Gestae Divi Augusti", in which Rome's first emperor Augustus detailed his accomplishments.

Debate still rages between historians about when exactly the text was written.

Though the text is riddled with exaggerations, irrelevant dates and erroneous geographical references, the researchers said that Aeneas was able to use subtle clues such as archaic spelling to land on two possible dates -- the two being debated between historians.