holds that Mark the Evangelist hosted the disciples in his house after Jesus' death, that the resurrected Jesus Christ came to Mark's house (John 20), and that the Holy Spirit descended on the disciples at Pentecost in the same house.
According to the Coptic tradition, Mark was born in Cyrene, a city in the Pentapolis of North Africa (now Libya). This tradition adds that Mark returned to Pentapolis later in life, after being sent by Paul to Colossae… and serving with him in Rome (2 Tim 4:11); from Pentapolis he made his way to Alexandria. When Mark returned to Alexandria, the pagans of the city resented his efforts to turn the Alexandrians away from the worship of their traditional gods. In AD 68, they placed a rope around his neck and dragged him through the streets until he was dead.
The Feast of St Mark is observed on April 25 by the Catholic and Eastern Orthodox Churches. For those Churches still using the Julian Calendar, April 25 according to it aligns with May 8 on the Gregorian Calendar until the year 2099.
In 828, relics believed to be the body of Saint Mark were stolen from Alexandria (at the time controlled by the Abbasid Caliphate) by two Venetian merchants with the help of two Greek monks and taken to Venice. A mosaic in St Mark's Basilica depicts sailors covering the relics with a layer of pork and cabbage leaves. Since Muslims are not permitted to eat pork, this was done to prevent the guards from inspecting the ship's cargo too closely.
Donald Nicol explained this act as "motivated as much by politics as by piety", and "a calculated stab at the pretensions of the Patriarchate of Aquileia." Instead of being used to adorn the church of Grado, which claimed to possess the throne of Saint Mark, it was kept secretly by Doge Giustiniano Participazio in his modest palace. Possession of Saint Mark's remains was, in Nicol's words, "the symbol not of the Patriarchate of Grado, nor of the bishopric of Olivolo, but of the city of Venice." In his will, Doge Giustiniano asked his widow to build a basilica dedicated to Saint Mark, which was erected between the palace and the chapel of Saint Theodore Stratelates, who until then had been patron saint of Venice.
In 1063, during the construction of St Mark's Basilica in Venice, Saint Mark's relics could not be found. However, according to tradition, in 1094, the saint himself revealed the location of his remains by extending an arm from a pillar. The newfound remains were placed in a sarcophagus in the basilica.
Copts believe that the head of Saint Mark remains in a church named after him in Alexandria, and parts of his relics are in Saint Mark's Coptic Orthodox Cathedral, Cairo. The rest of his relics are in Venice. Every year, on the 30th day of the month of Paopi, the Coptic Orthodox Church celebrates the commemoration of the consecration of the church of Saint Mark, and the appearance of the head of the saint in the city of Alexandria. This takes place inside St Mark's Coptic Orthodox Cathedral in Alexandria.
In June 1968, Pope Cyril VI of Alexandria sent an official delegation to Rome to receive a relic of Saint Mark from Pope Paul VI. The delegation consisted of ten metropolitans and bishops, seven of whom were Coptic and three Ethiopian, and three prominent Coptic lay leaders.
The relic was said to be a small piece of bone that had been given to the Roman pope by Giovanni Cardinal Urbani, Patriarch of Venice. Pope Paul, in an address to the delegation, said that the rest of the relics of the saint remained in Venice. The delegation received the relic on June 22, 1968.