 He is buried in a tomb in St. Peter's Basilica in Rome.Orsini's status put him in a position to be a major patron of the arts, and during the pontificate of Martin V (1417–31), the Cardinal of Santa Sabina, as he was called, became the center of an early circle of humanist culture that included Leonardo Bruni, Poggio Bracciolini, Leonardo Dati and Lorenzo Valla, who recalled how the scholars would gather, dressed in antique robes, to discuss topics of human conduct in Classical and Christian terms.This patron of artists and scholars assembled a library that comprised 244 manuscripts, which passed at his death intact to the Vatican Library.