According to a marginal lemma in the only manuscript that carries the poem (Palat. gr. 23+ Paris, gr. suppl. 384), the painting of the world described in a well-known ecphrasis by John of Gaza was situated in the winter baths of Gaza. According to the standard edition of John's poem by P. Friedlaender, these are the baths Choricius of Gaza refers to as in course of construction at Gaza in A.D. 535 or 536. If so, then both the painting and John's poem would have to be later than this. And since the poem does not claim to have been written for the dedication of the baths, it might be considerably later. G. Krahmer even dated it to the seventh century, on the grounds that John misunderstood some details of the picture he was describing.