The Glosas Emilianenses are a collection of glosses, or annotations, written in the early 10th century. They were discovered in a manuscript from the monastery of San Millán de la Cogolla in La Rioja, Spain. These glosses provide translations and explanations of Latin texts into the early form of the Spanish language, showcasing the linguistic transition from Latin to the vernacular. These annotations are significant for understanding the development of the Spanish language and its early dialects. The Glosas Emilianenses are among the oldest known examples of written Spanish, reflecting the cultural and linguistic changes occurring in the Iberian Peninsula during the Middle Ages.