Asturian (æˈstʊəriən; asturianu astuˈɾjanʊ, formerly also known as bable ˈbaβlɪ) is a West Iberian Romance language spoken in the Principality of Asturias, Spain. Asturian is part of a wider linguistic group, the Asturleonese languages. The number of speakers is estimated at 100,000 (native) and 450,000 (second language). The dialects of the Astur-Leonese language family are traditionally classified in three groups: Western, Central, and Eastern. For historical and demographic reasons, the standard is based on Central Asturian. Asturian has a distinct grammar, dictionary, and orthography. It is regulated by the Academy of the Asturian Language. Although it is not an official language of Spain it is protected under the Statute of Autonomy of Asturias and is an elective language in schools. For much of its history, the language has been ignored or "subjected to repeated challenges to its status as a language variety" due to its lack of official status.
Asturian is the historical language of Asturias, portions of the Spanish provinces of León and Zamora and the area surrounding Miranda do Douro in northeastern Portugal. Like the other Romance languages of the Iberian peninsula, it evolved from Vulgar Latin during the early Middle Ages. Asturian was closely linked with the Kingdom of Asturias (718–910) and the ensuing Leonese kingdom. The language had contributions from pre-Roman languages spoken by the Astures, an Iberian Celtic tribe, and the post-Roman Germanic languages of the Visigoths and Suevi.
The transition from Latin to Asturian was slow and gradual; for a long time they co-existed in a diglossic relationship, first in the Kingdom of Asturias and later in that of Asturias and Leon. During the 12th, 13th and part of the 14th centuries Astur-Leonese was used in the kingdom's official documents, with many examples of agreements, donations, wills and commercial contracts from that period onwards. Although there are no extant literary works written in Asturian from this period, some books (such as the Llibru d'Alexandre and the 1155 Fueru d'Avilés) had Asturian sources.