Feeding mediæval dragons

‘And in Sicily there is a manner of serpent, by the which men assay and prove, whether their children be bastards or no, or of lawful marriage: for if they be born in right marriage, the serpents go about them, and do them no harm, and if they be born in avoutry, the serpents bite them and envenom them. And thus many wedded men prove if the children be their own.’

The Travels of Sir John Mandeville