John IV (Italian: Giovanni d'Acquarola or Giovanni Scriba; died 17 December 849), also known as the Peacemaker and John the Serene,[1] was an Italian Catholic prelate who served as Bishop of Naples from 26 February 842 until his death.
He had the relics of Aspren translated to a chapel in the church of Santa Restituta in Naples.
[2] He also assisted Duke Andrew II in negotiating the Pactum Sicardi, an economic treaty, with Sicard, Prince of Benevento.
[3] He was canonized after his death and is one of the patron saints of Naples.
His feast day is 22 June.