The earliest authenticated printed version of the Amadís de Gaula, a prose romance of chivalry reworked and expanded into four books (and a subsequently published sequel) by the Spaniard Garcí Rodríguez de Montalvo, appeared at Saragossa in 1508. Between this date and 1492 an earlier edition of Montalvo's work was undoubtedly published, probably in Castile. As we shall see, this may or may not have been partly or wholly identical in content with a MS. Amadis embodying certain changes in the Briolanja episode made at the instigation of a Prince Alfonso of Portugal. Before 1379 there was an Amadis in three books circulating in Castile, and about this same time a version, perhaps the same, by one Vasco Lobeira of Portugal was extant. Moreover, there was an Amadis of unknown proportions, but presumably of one or two books only, as early as 1345–50. I shall show that this version may have been written in 1331. But no version, I repeat, survives except Montalvo's.