Tradition of the Virgin Mary's snakes in Kefalonia

Every year between August 6 and August 16, the village of Markopoulo on the Greek island of Kefalonia observes the traditional appearance of the 'Virgin Mary’s snakes' (fidakia tis Panagias) at the Church of Panagia Fidousa. Thousands of visitors arrive annually for this event, which is deeply rooted in local religious customs.

The snakes are identified scientifically as Telescopus fallax, commonly known as the cat snake or 'agiofido'. They are widely distributed across the Greek mainland and most islands. These snakes are considered harmless to humans because their venom is extremely weak; they possess fixed teeth located in the rear of the oral cavity that channel toxins slowly from Duvernoy’s glands only during persistent biting.

Local tradition holds that the failure of these snakes to appear is a bad omen, historically associated with disasters such as the devastating 1953 earthquake on the island. The appearance is widely regarded by the local population as a miraculous event linked to the Feast of the Dormition of the Mother of God, celebrated on August 15.