During a construction project in Cologne he unintentionally uncovered a Roman wall that he had identified as part of an assembly hall.
In this way, they found the oldest library in Germany. Region M.Ö. It was used by the Romans in 38.
Mosaics built in the second century and the Roman ruins such as aqueducts, walls, sewerage and cultural enrichment were found in the form of a library.
The 1,800-year-old library was two stories tall and filled with at least a few thousand parchments.
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