Peter Paul Rubens.

Downline, second from the left:

Peter Paul Rubens, a ‘selfie’. Born in Siegen, which is why Siegen is also known as the Rubens city. He did his apprenticeship in Antwerp & also lived in Cologne. A very interesting story. Links: Peter Paul Rubens ; Rubens Fountain (german only)

The Upper Castle Museum contains many paintings by the famous painter.