No word of Keats's own or of his friends prepares us for this new achievement or informs when he began first to think of the subject. It must of course have been ripening in his mind some good while before he thus suddenly and swiftly cast it into shape. When he wrote three months earlier of having to seek relief beside the sick-bed of his brother by 'plunging into abstract images,' were they images of primeval Greek gods and Titans only, or were these contrasted figures and colours of mediaeval romance beginning to occupy his imagination at the same time? Had the subject perhaps come into his mind as long ago as the preceding March, when Hunt and Reynolds and he were having the talks about Boccaccio which resulted in Keats's _Isabella_ and Reynolds's _Garden of Florence_ and _Ladye of Provence_? We shall see that Boccaccio counts for something in Keats's treatment of the St Agnes' Eve story, so that the supposition is at least plausible. Or may it even have been of this story and not, as is commonly assumed, of _Hyperion_ that he was thinking as far back as September 1817 when he wrote to Haydon from Oxford of the 'new romance' he had in his mind? Woodhouse does not throw much light on such questions when he tells us that 'the subject was suggested by Mrs Jones.' This name, uncongenial to the muse (excepting the muse of Wordsworth) is otherwise unknown in connexion with Keats. Did the same lady also tell him of the tradition concerning St Mark's day (April 25th), and so become the 'only begetter' of that remarkable fragment _The Eve of St Mark_, which he wrote (Woodhouse again is the authority for the dates) between the 13th and 17th of February after his return to Hampstead? In connexion with Keats few stones have been left unturned for further personal or critical research, but here is one.