After the end of the first persecution, the place of the saint's burial was revealed.
Mercurius appeared to a poor man in the city and told him that he was "Mercurius, the Martyr of the Lord." "
My body is buried in Cappadocia Gardens, under the old house on the way to the royal palace.
My body looks as white as snow, because Jesus was present at the time of my martyrdom," said the saint.

The next morning, the man went to dig under the old house.
He began to smell the scent of perfume, seeing the body of the saint.
The news spread quickly and many people came to take a look at the blessed body.
They moved it temporarily to the local church until they built a new church bearing his name where Mercurius' body was buried with respect and devotion.

A few years later, the Catholicos of Armenia and the Chief bishop of the Armenian Apostolic Church, visited Egypt and met with the Patriarch of Alexandria, the leader of the Coptic Orthodox Church.
The latter asked him if Egypt could have part of the relics of Saint Mercurius to be placed in the church that bears his name in Egypt.
On 9 Paoni (16 June), part of the blessed relics of Saint Mercurius were transferred to Egypt.

According to one tradition, Saint Basil once prayed before an icon on which Mercurius was portrayed as a soldier carrying a spear.
He asked God not to permit the emperor Julian the Apostate (361-363) to return from his war against the Persians and resume his oppression of Christians.
The image of the holy Great Martyr Mercurius depicted on the icon became invisible, only to reappear later with a bloodied spear.
Julian the Apostate, on his Persian campaign, was mortally wounded by the spear of an unknown soldier.

The nuns and their abbess, Mother Irini at the St. Mercurius Monastery in Cairo credit the saint's intercession for the reversal of a government decision to confiscate their property for the Defense Ministry.
After the end of the first persecution, the place of the saint's burial was revealed. Mercurius appeared to a poor man in the city and told him that he was "Mercurius, the Martyr of the Lord." "My body is buried in Cappadocia Gardens, under the old house on the way to the royal palace. My body looks as white as snow, because Jesus was present at the time of my martyrdom," said the saint.
The next morning, the man went to dig under the old house. He began to smell the scent of perfume, seeing the body of the saint. The news spread quickly and many people came to take a look at the blessed body. They moved it temporarily to the local church until they built a new church bearing his name where Mercurius' body was buried with respect and devotion.
A few years later, the Catholicos of Armenia and the Chief bishop of the Armenian Apostolic Church, visited Egypt and met with the Patriarch of Alexandria, the leader of the Coptic Orthodox Church. The latter asked him if Egypt could have part of the relics of Saint Mercurius to be placed in the church that bears his name in Egypt. On 9 Paoni (16 June), part of the blessed relics of Saint Mercurius were transferred to Egypt.
According to one tradition, Saint Basil once prayed before an icon on which Mercurius was portrayed as a soldier carrying a spear. He asked God not to permit the emperor Julian the Apostate (361-363) to return from his war against the Persians and resume his oppression of Christians. The image of the holy Great Martyr Mercurius depicted on the icon became invisible, only to reappear later with a bloodied spear. Julian the Apostate, on his Persian campaign, was mortally wounded by the spear of an unknown soldier.
The nuns and their abbess, Mother Irini at the St. Mercurius Monastery in Cairo credit the saint's intercession for the reversal of a government decision to confiscate their property for the Defense Ministry.
Saint Mercurius