The chief authority on these malignant beings is Leo Allatius[466], who both quotes a series of passages which enable us to trace the development of the belief in them, and also tells a story which is the only source of evidence concerning other of their characteristics than their appetite for the flesh of infants.
Their prototype, mentioned, we are told, by Sappho, was the maiden Gello, whose spectre after her untimely end was said by the people of Lesbos to beset children and to be chargeable with the early deaths of infants[467].
The individuality of this Gello continued to be recognised to some extent as late as the tenth century[468]; for Ignatius, a deacon of Constantinople, in his life of the Patriarch Tarasius named her as a single demon, though he added that the crime of killing children in the same way was also imputed to a whole class of witches. ‘Hence,’ comments Allatius, ‘it has come about that at the present day Striges (i.e. the witches of whom Ignatius speaks), because they practise evil arts upon infants and by sucking their blood or in other ways cause their death, are called Gellones[469].’ In the story also which exhibits the chief qualities of this demon, her name (in the form Γυλοῦ) appears still as a proper name.
But the multiplication of the single demon into a whole class dates from long before the time of Allatius. John of Damascus in the eighth century used the plural γελοῦδες as a popular word, the meaning of which he took to be the same as that of Striges (στρίγγαι); and Michael Psellus too in the eleventh century evidently regarded these two words as interchangeable designations of a class of beings (whether of demons or of witches, he leaves uncertain); for after an exact account of the Striges and their thirst for children’s blood, he says that new-born infants who waste away (as if from the draining of their blood by these Striges) are called Γιλλόβρωτα[470], ‘Gello-eaten.’
The story of Leo Allatius[471], which sets forth the chief qualities of Gello, is a legend of which the Saints Sisynios and Synidoros are the heroes. The children of their sister Melitene had been devoured by this demon, and they set themselves to capture her. She, to effect her escape, at once changed her shape, and became first a swallow and then a fish; but, for all her slippery and elusive transformations, they finally caught her in the form of a goat’s hair adhering to the king’s beard. Then addressing to her the words ‘Cease, foul Gello, from slaying the babes of Christians,’ they worked upon her fears until they extorted from her a confession of her twelve and a half names, the knowledge of which was a safeguard against her assaults.