
In a letter of 28 April, 1618, to the collector Sir Dudley Carleton; transl. from Italian, R. Saunders Magurn, The letters of Peter Paul Rubens, Cambridge Mass., 1955, p.60-61
Rubens is indicating in this letter to a good client the level of his personal involvement in several paintings which were offered then for sale. Rubens is specifying his involvement in a variety of degrees, in relation to the attribution by pupils or by other fellow-artists - like his cooperation in many paintings with Breughel, for instance
1605 - 1625