Around 2,600 years ago, in a military fortress in Southern Judah, a man called Eliashib sent and received messages written in ink on fragments of pottery. The contents were mundane, mainly concerning food supplies, but they provide evidence of literacy that could inform the debate about when major Biblical texts were written.
Eliashib’s correspondence happened on the cusp of the fall of the Kingdom of Judah, which took place during 588-87 BCE. The date plays an important role in an ongoing debate among Biblical scholars: were the first Biblical texts produced before the fall of Jerusalem—as events were unfolding—or afterwards? One part of the debate hinges on the literacy levels at the time: if the pre-demolition population wasn’t generally literate, it wouldn’t have been likely that important historical texts were created in this era.
But Eliashib and his colleagues in the Arad military fortress provide some evidence that literacy in this era may have been more widespread than previously thought. A multidisciplinary group of researchers from Tel Aviv University have combined their expertise in applied math, Jewish history, and archaeology to assess communications from the fortress, trying to establish how many people, and of what rank, were writing messages.
The ink-inscribed pottery fragments used by Eliashib are called ostraca, and more than 100 of them have been found in the remains of the Arad fortress, which is around 50 miles south of modern Jerusalem. Of these, 16 were long enough and legible enough for computer analysis. This one is typical: “To Eliashib, and now: Issue from the wine 3 baths and Hananyahu has commanded you to Beersheba with 2 donkeys’ load and you shall wrap up the dough with them.”
After they had reconstructed the faded brush strokes, the researchers developed new machine learning methods for handwriting analysis. These methods could describe elements of the handwriting, such as the angles between different strokes, and estimate how likely it was that different messages were written by the same person. If it was less than two percent likely, the authors took the messages as having been written by different people. Based on this, they estimate that six different people were responsible for the 16 ostraca in the analysis.

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