In addition to being a painter of some repute, Peter Paul Rubens was also a diplomat:
In Master of Shadows, Mark Lamster tells the story of Rubens's life and brilliantly re-creates the culture, religious conflicts, and political intrigues of his time. Commissions to paint military and political leaders drew Rubens from his Antwerp home to London, Madrid, Paris, and Rome. The Spanish crown, recognizing the value of his easy access to figures of power, enlisted him into diplomatic service. His uncommon intelligence, preternatural charm, and ability to navigate through ever-shifting political winds allowed him to negotiate a long-sought peace treaty between England and Spain even as Europe's shrewdest statesmen plotted against him.
and a graphic designer.
Moretus was Rubens's most frequent design client. To save his friend money, Rubens generally did his work for Plantin on holidays, so he would not have to charge Moretus his rather exorbitant day rate (Rubens was notorious for his high prices), and even then he agreed to be paid in books.