Oldest publisher

Oldest publisher
Who
Cambridge University Press
When
01 January 0001
Cambridge University Press has a continuous history of printing and publishing since 1584. The University received Royal Letters Patent to print and sell all manner of books on 20 Jul 1534.
In 1978, Oxford University Press (OUP) celebrated the 500th anniversary of the printing of the first book in the City of Oxford in 1478. This was before OUP itself was in existence.