A cephalophore is a saint who is generally depicted carrying their own severed head. In Christian art, this was usually meant to signify that the subject in question had been martyred by beheading. Depicting the requisite halo in this circumstance offers a unique challenge for the artist: some put the halo where the head used to be, others have the saint carrying the halo along with the head, and some split the difference. Associated legends often tell of the saint standing and carrying their own head after the beheading.

Denis of Paris was a 3rd-century Christian martyr and saint. According to his hagiographies, he was bishop of Paris in the third century and, together with his companions Rusticus and Eleutherius, was martyred for his faith by decapitation. Some accounts placed this during Domitian's persecution and incorrectly identified St Denis of Paris with the Areopagite who was converted by Paul the Apostle and who served as the first bishop of Athens. Assuming Denis's historicity, it is now considered more likely that he suffered under the persecution of the emperor Decius shortly after AD 250.