 As a humanist he kept a correspondence with Poggio Bracciolini.After the death of Franciscus Zabarella, "papatu dignissimus iudicatus" ("adjudged worthy of the papacy"), in late September 1417 at the Council of Constance, Pietro was one of those attending who, along with Barzazzi and Pierpaolo Vergerio, composed a eulogy for the cardinal.Pietro and Giovanni Berardi, Archbishop of Taranto, were co-presidents of the Council of Basel appointed by Pope Eugene IV.