 He also owned 358 manuscripts of Thomas Aquinas, including the "Prima pars" and the "Prima secundae".It has been suggested that Pietro, among other Paduan humanists, like Ciriaco, Francesco Barbaro, Jacopo Zeno, Palla Strozzi, and Leon Battista Alberti, may have influenced the classicism of the work of Donatello—especially his equestrian monument to Gattamelata—during his Paduan years (1444–53), when he had a studio near the Santo.Pietro had work done on the episcopal palace during his tenure.