Juan Ruiz's Libro de Buen Amor is one of the major literary accomplishments of the Iberian Middle Ages, and has generated an extensive secondary bibliography. The current volume contains a series of essays that offer new scholarly insights into the Libro, in tribute to the late G. B. Gybbon-Monypenny and his 'Libro de buen amor' Studies, and contextualize the Libro for a fresh generation of readers. The articles offer surveys and new insights on the context and socio-political milieu of Juan Ruiz (Louise M. Haywood), the Libro's metrics (Martin J. Duffell), its use of traditional wisdom (Barry Taylor), and its transmission (Jeremy Lawrence), the central episodes of Don Amor and Dona Endrina (Alan Deyermond, Dorothy S. Severin), and the application to the Libro of modern critical approaches, drawing on Mikhail Bakhtin, folklore studies, chaos theory, and reader-reception theory (Elizabeth Drayson, Laurence de Looze, Louise O. Vasvari).