Ammon was one of the few Christians martyred in Egypt during the reign of Emperor Decius. A man who was once imprisoned and brought to a judge because he was a Christian was terrified of punishment. Then there were some Christians among the soldiers guarding there. They gave him hints that they should not abandon the faith through signs. Seeing this, the judge summoned the soldiers and questioned them. They boldly professed Christianity. They were all tortured and martyred along with the fearless Christian.
The chief of them was Ammon. His other martyrs were Cena, Ptolemy, Ingenius, and Theophilus.