First published in 1926, as part of the Cambridge Plain Texts series, this volume contains material from three medieval Spanish treatises on linguistics: El arte de trobar by Enrique de Villena (1384–1434); the second book of Gramática castellana by Antonio de Lebrija (1444–1522); and the Arte de la poesía castellana by Juan del Encina (1469–1529). Texts are presented in the original Spanish with a short editorial introduction and bibliography in English. This book will be of value to anyone with an interest in Spanish and the history of linguistics.