The Archive of the Cathedral of León it preserves 200 unique codices in the world and has more than 50,000 collections that have been compiled over eleven centuries by archivists and allow us to understand many important aspects of the history of Spain.
The archive houses important documents such as a document of King Shiloh from the year 775, an original and authentic diploma certifying the donation of various properties of Silo to the religious of Lucis.
La Pulchra also preserves 88 unique codices, including one of the most important in the world, the Palimpsest, containing the Lex Romana Wisigothorum, texts from the Bible and a Latin translation of Eusebius's Ecclesiastical History.
One of the most valuable documents from the historical point of view is one that belongs to the year 1012 and tells of the rebellion and civil war that he had to face Alfonso V few years after granting the Fuero de León.
Other documents speak of the foundation of the church of San Claudio, re-founded by Ordoño III in the year 954 and which was in ruins due to abandonment.