Rome also offered Poussin a flourishing art market and an introduction to an important number of art patrons. Through Marino, he was introduced to Cardinal Francesco Barberini, the brother of the new Pope, and to Cassiano dal Pozzo, the Cardinal's secretary and a passionate scholar of ancient Rome and Greece, who both later became his important patrons. The new art collectors demanded a different format of paintings; instead of large altarpieces and decoration for palaces, they wanted smaller-size religious paintings for private devotion or picturesque landscapes, mythological and history paintings.