 Both the pavilion and the rockwork "Parnasse de Gaillon" contained grottos, the one natural, the other architectural.In 1566, when the Cardinal entertained Catherine de' Medici during the siege of Rouen at the height of the Wars of Religion, the "Maison Blanche" was the setting for a pastoral masque.The features were engraved by Jacques Androuet du Cerceau, whom William Howard Adams has suggested may have designed the ensemble (Adams 1969 p. 25-26, figs 17-18).