This study of the Claros Varones is a semi-paleographic edition - that is, its orthography reproduces closely the language as it was in the original archetype. It is hoped that those interested in the development of the Spanish language will find this edition useful in the classroom as well as for their philological research. Its intended audience, though, is mainly students of the Old Spanish language. In fact, given the short internal divisions within the text, this work can easily be used as a textbook, where the philological/linguistical features and historico-literary aspects can be discussed in the classroom and/or given as assignments. Moreover, it is a must for anyone interested in the tradition of Spanish historiography.