Propyläen Verlag

The Propyläen Verlag is an imprint of the German Ullstein Verlag, based in Berlin. It publishes non-fiction books, biographies, and classic editions.

From the Wikipedia article “Propyläen Verlag”, licensed under CC BY-SA 4.0.

An imprint is a brand inside a larger publishing house, often with its own editors and list. Imprints of large groups usually acquire through literary agents; read recent titles to see whether your book fits the list, then target agents who sell to it.