The Calixtino Codex kept in the archives of the Cathedral of Santiago is the first issue of the Liber Sancti Jacobi, an anonymous compilation that contains, in five books, various texts referring to the Apostle: liturgical texts, miracles, the exploits of Charlemagne in Spain, compositions musical and, in the fifth book, the Pilgrim’s Guide. The compilation, attributed to Pope Callistus II, is dedicated to Gelmírez and the patriarch of Jerusalem, uniting, in this symbolic way, the three great centers of pilgrimage. As a curious fact, the fact that in a text interspersed in the Codex in the s. XV, the first mention of the botafumeiro is made.
The copy of the Codex of the University of Salamanca is probably derived from a twin of the Compostela example. It also has five books, although it lacks the musical script and appendices of the original, apart from other differences. The book Die Walfart und Strass zu Sant Jacob by Hermann Künig von Vach is the only pilgrimage guide in the strict sense, since the other German works, more or less contemporary, are stories of the trip. The successive re-editions of the work have small variations depending on the place of printing, since, having an eminently practical use, the interests of the pilgrims were, logically, different. On the other hand, his inspiration in works of popular character is confirmed by the fact that some passages are found in the pilgrim song Wer das elend bauwen Hill, as well as in the style of his engravings.
At present, composer Cándido Pazos has published the Codex Calixtino in the Ways to Santiago, a contemporary adaptation of this manuscript of the twelfth century which is, in several languages, the seven roads in their Galician sections. In addition, the work carries illustrations by the author himself.