[2] On 11 Apr 1580, Pietro Orsini was appointed during the papacy of Pope Gregory XIII as Coadjutor Bishop of Spoleto and Titular Bishop of Hippos.
[3][4][5] On 17 Apr 1580, he was consecrated bishop by Giulio Antonio Santorio, Cardinal-Priest of San Bartolomeo all'Isola, with Paolo Odescalchi, Bishop Emeritus of Penne e Atri, and Ludovico Taverna, Bishop of Lodi, serving as co-consecrators.
[4] On 16 May 1581, he succeeded Flavio Orsini as Bishop of Spoleto.
[4] On 5 Apr 1591, he was appointed during the papacy of Pope Gregory XIII as Bishop of Aversa, he succeeded Giorgio Manzolo as Bishop of Aversa.
This article about a 16th-century Italian Catholic bishop or archbishop is a stub.