Romulus Appearing to Julius Proculus
Peter Paul Rubens
c. 17th century
Tempera on Paper

In the image below, you can see another version of the scene, also by Peter Paul Rubens. Some art historians believe that these two paintings are part of a series of practice paintings, or cartoons, intended for a set of tapestries.
“Two tapestries had been found related to two of the four cartoons, one in Cardiff [Wales] and one in a private collection in Italy. Inscriptions in the borders prove that the tapestries and the cartoons depict a Romulus series.” – RKD Netherlands Institute for Art History
Art Terms
Cartoon (noun) – a full-scale preparatory drawing for a fresco, oil painting, or a tapestry.
The word comes from the Italian cartone, which simply means a large sheet of paper or card.