“Transmutation” is the term used by the anonymous authors of two midfifteenth- century Burgundian prose romances to designate the process by which they transform two of Chrétien de Troyes's romances, Erec et Enide and Cligés. The author of the prose Cligés, noting his contemporaries’ willingness to pass their time reading and listening to romances and histories, proposes to better serve them by transposing – the verb is transmuer – Alixandre's and Cligés's adventures from Old French verse to Middle French prose. But transmutation is not just translation. The prose redactors appropriate Chrétien's texts and modify them to such an extent as virtually to reinvent the original romances. These are not simply the verse romances stripped of Chrétien's inimitable irony and humor, as earlier critics had claimed. While the prose texts respect the general outline of the original plot, the transformations affect every aspect: language, style, and content. Many of the changes can be attributed to “acculturation,” a process of updating whereby, according to Jane H. M. Taylor, “the socio-culturally unfamiliar is recast in familiar terms, so that the reader can understand systems and phenomena in a source text as corresponding to his own ideologies, preconceptions and behaviour patterns.”