[1] In the old Grecian world, the Endymion myth, or rather an Endymion myth, for like other myths it had divers forms, was rooted deeply in the popular traditions both of Elis in the Peloponnese, and of the Ionian cities about the Latmian gulf in Caria. The central feature of the Carian legend was the nightly descent of the moon-goddess Seléné to kiss her lover, the shepherd prince Endymion, where he lay spell-bound, by the grace of Zeus, in everlasting sleep and everlasting youth on Mount Latmos. This legend was early crystallized in a lyric poem of Sappho now lost, and thereafter became part of the common heritage of Greek and Roman popular mythology. The separate moon-goddess, Seléné for the Greeks and Luna for the Romans, got merged in course of time in the multiform divinities of the Greek Artemis and the Roman Diana respectively; so that in modern literatures derived from the Latin it is always of Diana (or what is the same thing, of Cynthia or Phoebe) that the tale is told. It is not given at length in any of our extant classical writings, but only by way of allusion in some of the poets, as Theocritus, Apollonius Rhodius, and Ovid, and in Cicero and some of the late Greek prose-writers, as Lucian, Apollodorus, and Pausanias. From these it passed at the Renaissance into the current European stock of classical imagery and reference.
[2] In another place, Browne makes Endymion shut out from the favour of Cynthia stand figuratively for Raleigh in disgrace with Elizabeth: just as in Lyly's comedy the myth had been turned into an allegory of contemporary court intrigue, with Elizabeth for Cynthia, Leicester for Endymion, Tellus for Mary Queen of Scots, Eumenides for Sidney, and so forth.
[5] _Metam._ i. 26-31, Englished thus by Sandys:--
Forthwith upsprung the quick and weightless Fire, Whose flames unto the highest Arch aspire: The next, in levity and peace, is Air: Gross elements to thicker Earth repair Self-clogg'd with weight: the Waters flowing round Possess the last, and solid Tellus bound.
[6] Keats was more widely read in out-of-the-way French literature than could have been expected from his opportunities, and there are passages in _Endymion_ which run closely parallel to Gombauld's romance, notably the first apparition of Cynthia, with the description of her hair (_End._ i, 605-618), and the account of the sudden distaste which afterwards seizes him for former pleasures and companions. But these may be mere coincidences, and the whole series of the hero's subsequent adventures according to Gombauld, his dream-flight to the Caspian under the spell of the Thessalian enchantress Ismene, and all the weird things that befall him there, are entirely unlike anything that happens in Keats's poem.