In the Middle Ages, it was common for older works to be "erased" from the valuable, durable vellum upon which they were written so that it could be recycled. Modern technology now allows us to recover the original text of these "palimpsest" manuscripts -- and one recent discovery gives us new insights into Athenian history and democracy.

The Archimedes Palimpsest, sold at auction at ChristieÂ’s for $2 million in 1998, is best known for containing some of the oldest copies of work by the great Greek mathematician who gives the manuscript its name. But there is more to the palimpsest than ArchimedesÂ’ work, including 10 pages of Hyperides, offering tantalizing and fresh insights into the critical battle of Salamis in 480 B.C., in which the Greeks defeated the Persians, and the battle of Chaeronea in 338 B.C., which spelled the beginning of the end of Greek democracy.

The palimpsest is believed to have been created by Byzantine monks in the 13th century, probably in Constantinople. As was the practice then, the durable and valuable vellum pages of several older texts were washed and scraped, to remove their writing, and then used for a medieval prayer book. The pages of the older books became the sheaths of a newer one, thus a palimpsest (which is pronounced PAL-imp-sest and is Greek for “rubbed again”).

After the ChristieÂ’s sale the manuscript was left at the museum by the private collector for conservation and study. This year imagers at Stanford University used powerful X-ray fluorescence imaging to read its final pages, which are being interpreted, transcribed and translated by a group of scholars in the United States and Europe.

The new Hyperides revelations include two previously unknown speeches, effectively increasing this renowned oratorÂ’s body of work by 20 percent, said Judson Herrman, a 36-year-old professor of classics at Allegheny College in Meadville, Pa. He is one of a handful of classicists who have written doctoral dissertations on Hyperides.

Hyperides lived from 390 or 389 B.C. until 322 B.C. and was an orator who made speeches at public meetings of the citizen assembly. A contemporary of Aristotle and Demosthenes, he wrote speeches for himself and for others and spoke at important political trials. In 322 B.C. Hyperides was executed by the Macedonians for participating in a failed rebellion.

“It’s a spotlight shining on an important moment in history,” said Mr. Herrman, currently a fellow at the National Humanities Center in Research Triangle Park, N.C. Until the new leaves were found in the palimpsest, most scholars believed only fragments of Hyperides survived beyond the Classical period. The mystery of Archimedes’ treatise on combinatorics, the Stomachion, was solved in 2003 by deciphering the palimpsest. Now W. Robert Connor, the president of the Teagle Foundation, which provides education and financial resources for education, called the discovery of new Hyperides text a “tour de force of the first order.”

A combination of high-tech imagery and old-fashioned deciphering, sometimes letter by letter, was used to resurrect the older text, revealing a slice of Athenian history in the days after its devastating defeat by Philip II, king of Macedonia and the father of Alexander the Great, Mr. Connor said. “The number of times you get a new text is very small,” Mr. Connor, a former professor of classics at Princeton said. “It’s like hearing an old violin played at a superb level.”

It makes you wonder how many other important discoveries are waiting in libraries around the world, hidden behind beautiful but historically insignificant prayer books, Bibles, and other texts.

For more on the Archimedes Palimpsest, click here.

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