St. Cyriacus

Cyriacus is one of the Fourteen Holy Helpers and one of the Roman martyrs whose cult is well documented even when the biography behind it is not. He is commemorated with his companions Largus and Smaragdus, and the passio that gives them a biography assigns them to the Diocletianic persecution of the early fourth century, presenting Cyriacus as a Roman deacon who with his companions built baths and roads for Diocletian and who performed an exorcism on Diocletian's daughter Artemia — a detail that attached to his name the intercessory patronage against diabolic obsession and against the temptations of the devil in the last hour of life that made him one of the most universally invoked of the Holy Helpers.

The passio is late, schematic, and the healing of a royal princess is a narrative type that appears in too many martyr passions to be taken as biography in any individual case. The early Roman topographical evidence is more reliable. A cemetery on the Via Ostiensis bore the name of Cyriacus from at least the fourth century; a church titled to his name was built there and remained a site of pilgrimage throughout the medieval period; and the inclusion of his name in the ancient Roman martyrology provides the earliest and most reliable attestation of a genuine martyr of that name.

The intercessory role in the face of death — Cyriacus invoked at the moment of dying, to preserve the soul from the snares of the enemy — gave his feast a seriousness in popular piety that outlasted any particular biographical knowledge about him. There is a consistent pattern here: the martyr who endured the worst the world could do became in the imagination of the faithful the patron of those enduring the worst the soul can face.