Such scrolls this one is 36 meters (40 yards) long and 64 centimeters (25 inches) high are brought out in synagogues on the Sabbath and holidays, and portions are read aloud in public. Few such scrolls have survived since old or damaged Torahs have to be buried or stored in a closed room in a synagogue.
In a telephone interview, Perani said he was updating the library's Hebrew manuscript catalog when he stumbled upon the scroll in February. He said he immediately recognized the scroll had been wrongly dated by the last cataloger in 1889, because he recognized that its script and other graphic notations were far older.
Specifically, he said the scroll doesn't take into account the rabbinical rules that standardized how the Pentateuch should be copied that were established by Maimonides in the late 12th century. The scroll contains many features and markings that would be forbidden under those rules, he said.
The 1889 cataloger, a Jew named Leonello Modona, had described the letters in the scroll as "an Italian script, rather clumsy-looking, in which certain letters, as well as the usual crowns and strokes show uncommon and strange appendices," according to the University of Bologna release.
Perani, however, saw in the document an elegant script whose square letters were of Babylonian tradition, the statement said.
Perani told The Associated Press it was "completely normal" for a cataloger to make such a mistake in the late 1800s, given the "science of manuscripts was not yet born."
Outside experts said the finding was important, even though older Hebrew bibles do exist.
"It is fairly big news," said James Aitken, a lecturer in Hebrew and Old Testament studies at Cambridge University. "Hebrew scholars get excited by very small things, but it certainly is important and clearly looks like a very beautiful scroll."
However, Giovanni Garbini, a leading expert on ancient Semitic languages and retired professor at Rome's La Sapienza university, said the discovery doesn't change much about what the world knows about Hebrew manuscripts.
"It's an example of an ancient scroll," he said in a telephone interview, "but from the point of view of knowledge, it doesn't change anything."
Still, Stephen Pfann, acting president of the University of the Holy Land in Jerusalem and an expert in ancient Jewish manuscripts, said if accurately dated, the scroll is a rare and important find.
"We don't have anything much from that period," Pfann said.
There are far older scraps of Torah scrolls that can be dated back to the eighth century, but Pfann said it was rare to find a complete manuscript.
The find was also emotionally important, he said, because the scroll, as opposed to a bound book, is used for reading Torah portions throughout the year in synagogue.
"It's almost a friendship that they have come to know the Torah scroll in their midst," Pfann said, "and they draw their knowledge and focus on worship on how they live their daily life."
Perani said it remains a mystery how the scroll came to be part of the Bologna university library but that he anticipated further study would now begin.
The scroll remains in the library, he said, and doesn't require any extra conservation precautions beyond what it already has.