  One issue that did not arise is that of fictional names. Medieval logicians were concerned with problems of reference to dead persons, or to fictional entities such as chimeras or the phoenix, but I have yet to come across any discussion of fictional singular terms such as Frodo Baggins or Harry Potter. Buridan remarked that one might acquire fictitious singular concepts in dreams, but he did not speak of naming their non-existent objects. Perhaps the nearest anyone came to raising the problem of fictional names was hinted at in an early fifteenth-century discussion by Nicholas of Amsterdam. He mentioned the problem of Antichrist, who is named, though he does not yet exist. The solution depended on the claims that signification involves an aptitude, and that since Antichrist would exist in the future, he would then give rise to a genuine singular concept 