Lionel Henry Cust, Dictionary of National Biography… (1890)
“ In the Palazzo Quirinale in 1616 and the Palazzo Rospigliosi he painted pictures in conjunction with his intimate friend, Agostino Tassi, the landscape-painter. In the Palazzo Borghese there is one of his finest paintings, ‘Santa Cecilia and S. Valeriano.’ In 1621, on the accession of Pope Gregory XV, he was induced by the Genoese envoy, Giovanni Antonio Sauli, to go to Genoa, where he painted fine works in the palaces of the nobility, especially that of Marc Antonio Doria at S. Piero d'Arena. ”
