On 19 April 1621, Pietro Dini was appointed during the papacy of
Pope Gregory XV as
Archbishop of Fermo. On 9 May 1621, he was
consecrated bishop by
Ottavio Bandini,
Cardinal-Bishop of
Palestrina, with
Galeazzo Sanvitale,
Archbishop Emeritus of Bari-Canosa, and
Luca Alemanni,
Bishop Emeritus of Volterra, serving as
co-consecrators. He served as Archbishop of Fermo until his death in August 1625. ==Episcopal succession==