Fortunatus of Casei was a Christian saint who lived during the late third century. According to tradition, he was a member of the Theban Legion and was martyred at Agaunum in 286. While his death is linked to the Swiss Alps, his remains were historically kept in various Roman locations, including the catacombs of Pope Callixtus I and Saint Priscilla. His skull, which showed signs of a fatal head injury, was eventually moved to Casei Gerola in 1765.