Copts believe that his head is in his church at Alexandria and that other parts of his relics are housed at St Mark's in Cairo and San Marco Cathedral in Venice.
St Mark's Day was the traditional day for praying for fertile land and a good harvest. According to Keith Thomas, in Religion and the Decline of Magic, people would process across fields carrying the cross, banners and bells to bless the crops and drive away evil spirits. It derived from the Roman pagan tradition of asking the gods for a good harvest.
The symbol of St Mark is a winged lion and he is often depicted as a lion or with a lion beside him. According to one legend, he survived being thrown to the lions because instead of eating him they slept at his feet.
Here in our village in Spain, St Mark's Day, el día de San Marcos, is an important fiesta day. The whole village gets together to share a huge paella and some migas (an Andalucian dish made from breadcrumbs, garlic, paprika, vegetables and meat). Special San Marcos cakes are also enjoyed. They are like sweet bread and have a whole egg ((hen or quail) in the middle. When the bread is eaten, it is lucky to crack the egg (which is cooked) on someone's head.