Jan van Rillaer - Saint Margaret of Antioch (detail, ~1550)
[…]whilst she was in prison, she prayed our Lord to show her, in visible form, that the fiend that had fought with her. And then appeared a horrible dragon and assailed her, and would have devoured her, but she made the sign of the cross, and anon he vanished away. And in another place it is said that he swallowed her into his belly, she making the sign of the cross. And the belly brake asunder, and so she issued out all whole and sound.
(Jacobus de Voragine, The Golden Legend)