No great discernment is required to see that, after the appearance of _Johan Johan_, all that was needed for the complete development of comedy was the invention of a well-contrived plot. For reasons already indicated, Interludes were naturally deficient in this respect. Nor were the Moralities and Bible Miracles much better: their length and comprehensive themes were against them. There were the Saint Plays, of which some still lingered upon the stage; these offered greater possibilities. But here, again, originality was limited; the _denouement_ was more or less a foregone conclusion. Clearly, one of two things was wanted: either a man of genius to perceive the need and to supply it, or the study of new models outside the field of English drama. The man of genius was not then forthcoming, but by good fortune the models were stumbled upon. We say stumbled upon, because the absence of tentative predecessors and of anything approaching an eager band of successors, suggests an unpreparedness for the discovery when it came. Thus _Calisto and Melibaea_ (1530), an imitation of a Spanish comedy of the same name, though it contained a definitely evolved plot, sent barely a ripple over the surface of succeeding authorship. It represents the steadfastness of the maiden Melibaea against the entreaties of her lover Calisto and the much more crafty, indeed almost successful, wiles of the procuress, Celestine. True, the play is dull enough. But if dramatists had been awake to their defects, the value of the new importation from a foreign literature would have been noticed. The years passed, however, without producing imitators, until some time in the years between 1544 and 1551 a Latin scholar, reading the plays of Plautus, decided to write a comedy like them. Latin Comedies, both in the original tongue and in translation, had appeared in England in previous years, but only as strayed foreigners. Nicholas Udall, the head master of Eton School, proposed a very different thing, namely, an English comedy which should rival in technique the comedies of the Latins. The result was _Ralph Roister Doister_. He called it an Interlude. Posterity has given it the title of 'the first regular English comedy'.