Built as a recreational palace, it is situated on the southern side of Mount Naranco facing the city[clarification needed], and was originally part of a series of royal buildings located in the outskirts. Its character as a civil building changed in the 12th century when it was converted into a church dedicated to St. Mary. The Palace of Santa María del Naranco, involved a significant stylistic, morphological, constructive and decorative renovation of Pre-Romanesque, supplementing it with new, innovative resources, representing a leap forward with respect to immediately previous periods.

On its altar, a Latin inscription provides the date of consecration:(...) Per Famulum Tuum Ranimirum. Principe Gloriosum Cum Paterna Regina Coniuge Renovasti Hoc Habitaculum Nimia. Vetustate Consumptvm Et Pro Eis Aedificasti Hanc Haram Benedictionis Gloriosae. Sanctae Mariae In Locum Hunc Summum Exaudi Eos De Caelorum Habitaculo Tuo Et. (...) Die VIIIIo Kalendas Iulias Era Dccclxxxvia.[1][note 1]

This palace's innovations amazed chroniclers, who mention it repeatedly. The Crónica Silense, written around the year 1015, about 300 years after the construction of the palace, said that Ramiro I of Asturias "built many constructions, two miles away from Oviedo, with sandstone and marble in a vaulted work: (...) He also made (...), a palace without wood, of admirable construction and vaulted below and above,..."

The chroniclers marvelled at its proportions and slender shapes, its rich, varied decoration and the introduction of elongated barrel vaults thanks to the transverse arches, allowing support and eliminating wooden ceilings. This solution, timidly advanced in the Camara Santa (English: Holy Chamber) of the Cathedral of San Salvador of Oviedo, fully matured in Santa María del Naranco.

The palace, on a rectangular ground plan, has two floors. The lower level, or crypt, quite low, has a central chamber and another two located on either side. The upper floor is accessed via a double exterior stairway adjoining the facade, leading into an identical layout as the lower floor; a central or noble hall with six blind semicircular arches along the walls, supported by columns built into the wall, and a mirador at each end. These are accessed via three arches, similar to those onto the wall, resting on columns with helicoidal rope moulding, typical of Pre-Romanesque. The barrel vault is made from tufa stone, and is held up by six transverse arches resting on consoles.

Santa María del Naranco represented a step forward from a decorative point of view by enriching the habitual standards and models with elements from painting, gold work and the textile arts. The rich decoration is concentrated in the hall and miradors of the upper floor, where it is especially worth noting the cubic-prismatic capitals (of Byzantine influence), decorated with reliefs framed by cord decoration (from local tradition) in trapezoid and triangular shapes, inside which there are sculpted forms of animals and humans. This kind of motif is repeated on the disks with central medallions located above the blind arches' intersections. The 32 medallions distributed around the building are similar in size and shape, varying the decorative designs and the interior figures (quadrupeds, birds, bunches of grapes, fantastic animals), a style inherited from the Visigoth period, in turn descended from Byzantine tradition.

The medallions have decorative bands above them, again framed by rope moulding, inside which four figures are sculpted and arranged symmetrically; the upper two carrying loads on their heads and the lower two representing soldiers on horseback carrying swords. These figures seem to have some kind of symbolic social meaning; the warriors who defend and support the men of prayer, or alternatively, the royal and ecclesiastic orders complementing each other.

Santa María del Naranco shows other, equally beautiful and important sculptural elements; for the first time, a Greek cross appears sculpted as emblem of the Asturian monarchy, at the same time protecting the building from all evil, something which was to become habitual in the popular architecture of towns and villages. Other sculptural elements, such as the capitals of Corinthian inspiration on the miradors' triple-arched Windows or the altar stone in the eastern mirador (originally from the neighbouring Church of San Miguel de Lillo), make this palace the most distinctive building in Pre-Romanesque, a singularity highlighted by being the only palace complex that has lasted until the present day with both Visigothic and Carolingian court structures.

Cite error: There are <ref group=note> tags on this page, but the references will not show without a {{reflist|group=note}} template (see the help page).