Andrew, John, Peter, and Antoninus were Christians of Syracuse in Sicily who suffered martyrdom in Africa in the ninth century. According to the synaxarion, they were taken captive following the fall and destruction of Syracuse and brought across the sea by the African ruler Ibrahim. They are commemorated together on September 23.
John and his two sons, Peter and Antoninus, were carried to Africa by Ibrahim, who compelled the youths to study the Arabic language and sciences. As they grew, Ibrahim came to value them for their learning and the virtue of their conduct: he named Antoninus his kinsman and appointed Peter as his chief steward. Andrew is commemorated alongside them as a fellow martyr of the same persecution.
When Ibrahim discovered that the young men secretly confessed faith in Christ, he turned against them in anger and ordered them bound in iron shackles and beaten with rods. The synaxarion relates that each of the four endured a distinct death, after which their bodies were cast together into a fire.