Career
After the Council of Chalcedon, Peter Mongus was an ardent adherent of Miaphysitism and deacon of Timothy Aelurus. After Timothy expelled the Chalcedonian Patriarch Proterius I in 457, Mongus took part in the persecution of the Chalcedonians. However, the Byzantine Emperor Zeno brought Timothy Salophakiolos, a Chalcedonian who had supplanted Aelurus before in 460, back to Alexandria and sentenced Mongus to death.
Mongus escaped by flight and remained in hiding until 482.
In the previous year, John Talaia had succeeded Timothy Salophakiolos as Patriarch. However, as Talaia refused to sign Emperor Zeno"s Henoticon (which glossed over the Council of Chalcedon), the Emperor expelled him and recognized Mongus as the legitimate Patriarch on the condition that he would sign the Henoticon.
Mongus complied and after taking possession of the see, he signed the controversial document and sent notice of his succession to his fellow Patriarchs. Patriarch Acacius of Constantinople entered him into his diptychs as Patriarch of Alexandria.
As Acacius maintained the Henoticon and communion with Mongus, the Pope excommunicated the Patriarchs in 484.
This Acacian schism lasted until 519. He held a synod to condemn Chalcedon, and desecrated the tombs of his two Chalcedonian predecessors Proterios and Timothy Salophakiolos. When Acacius died in 489, Mongus encouraged his successor Fravitta to maintain the schism with Rome.
Fravitta"s successor Euphemius sought to heal the schism by excommunicating Mongus, who however died soon afterwards in 490.
