Golden Legend
According to the Golden Legend, compiled by the Italian Jacobus de Voragine, Saint Margaret the Virgin was swallowed by Satan in the shape of a hydra, but she escaped alive when the cross she carried irritated the hydra's innards. The Golden Legend, in an atypical moment of scepticism, describes this last incident as "apocryphal and not to be taken seriously" (trans. Ryan, 1.369), which did not prevent the legend from being popular and getting artistic treatments.