Evidently Shangtu, Coleridge's Xanadu. See his well-known lines—'In Xanadu did Kubla Khan,' &c.
This is Chaucer's 'Sarra'; see note to F 9.
Mr. Keightley shews, in his Tales and Popular Fictions, p. 75, that Cervantes has confused two stories, (1) that of a prince carrying off a princess on a wooden horse; and (2) that of Peter of Provence running away with the fair Magalona.
See Arber's reprint, p. 85, where 'the hors of tree' [i.e. wood], ridden by 'Cleomedes the kynges sone,' is expressly mentioned, and is said to be 'torned' by 'a pynne that stode on his brest.'
This magic ring is likewise referred to in chap. 32 of Caxton's Reynard the Fox. It had 'thre hebrews names therin,' and it contained 'a stone of thre maner colours.' The same chapter mentions the magic mirror.