Truly speaking Rubens probably painted less than 1500 works. This means that at least as many were produced by his pupils, his followers and his imitators.
Snyders used to apply a secret signature representing a vase of flowers, including roses and irises, which appears in several paintings that were attributed to Rubens, and perhaps painted many works given as by the latter.
Rubens was said to have offered Snyders a partnership in 1610 on condition that all works sold would bear his signature. Today many paintings authenticated as by Rubens have been in fact considered to be by Snyders.
Rubens also took advantage of van Balen, who was Van Dyck's and Snyders' master. Several religious paintings by van Balen have thus been wrongly attributed to Rubens during the past two centuries.
Van Dyck was said to have painted some 2000 works, a considerable number given the fact that he died at 41. He also reportedly painted over 800 works that were attributed to Rubens and it has thus been quite difficult to determine how many paintings he really produced as well as how many were wrongly attributed. In addition, Van Dyck worked with Rubens during a certain time. Still, van Dyck himself was much copied by many 17th Century European painters.
Other imitators of van Dyck were Gainsborough and Rigaud and it is easily understandable that numerous copies produced by so many great artists were eventually considered as genuine van Dyck works two or three centuries later.
Jordaens, another good painter, used the services of Adriaen van Utrecht, Jan Wildens or Paul de Vos to paint figures in his paintings and many of his works were also attributed to Rubens.
Jordaens employed many aides as well to produce some enormous quantities of works commissioned by several European courts. These aides were Charles du Val, Pieter du Moulin, Jan Kergiter, Matthew Peetersen, Roger de Cuyper, Henrik Willemsen, H. Rockx, Guilliam de Vries, A. de Meyer, A. Snyders, Conrad Hanssens, Paul Goetvelt, Arnold Jordaens, Mercelis Librecht, Jan de Bruyn, H. Kerstens, H. Wildens, Daniel Verbraken, J.G Huybrechts, J. B. van der Broeck or G. Waldon.