Ancient Public Library Discovered In Germany (theguardian.com)
Archaeologists have discovered the remains of the oldest public library in Cologne, Germany, "a building erected almost two millennia ago that may have housed up to 20,000 scrolls," reports The Guardian. From the report: The walls were first uncovered in 2017, during an excavation on the grounds of a Protestant church in the centre of the city. Archaeologists knew they were of Roman origins, with Cologne being one of Germany's oldest cities, founded by the Romans in 50 AD under the name Colonia. But the discovery of niches in the walls, measuring approximately 80cm by 50cm, was, initially, mystifying.
"It took us some time to match up the parallels -- we could see the niches were too small to bear statues inside. But what they are are kind of cupboards for the scrolls," said Dr Dirk Schmitz from the Roman-Germanic Museum of Cologne. "They are very particular to libraries -- you can see the same ones in the library at Ephesus." It is not clear how many scrolls the library would have held, but it would have been "quite huge -- maybe 20,000," said Schmitz.
"It took us some time to match up the parallels -- we could see the niches were too small to bear statues inside. But what they are are kind of cupboards for the scrolls," said Dr Dirk Schmitz from the Roman-Germanic Museum of Cologne. "They are very particular to libraries -- you can see the same ones in the library at Ephesus." It is not clear how many scrolls the library would have held, but it would have been "quite huge -- maybe 20,000," said Schmitz.
... probably had to be taken away due to copyright claims of some imperial Roman mega-corporations.
Ancient libraries were very often (nearly always?) private. They would either serve a particular institution, such as a government body, or some were only open to members who paid the high membership fees (compare a country club). For example, the vast majority of the holdings of Library of Congress aren't available of the public.
The article indicates they think it was a public library because it was located near the center of town, next.to a church, and there were public buildings nearby. Again, the Library of Congress is at the center of Washington, near public buildings, across the street from the capitol, the Supreme Court building, and a church. It's not a public library.