Martyrial double plan building following a design that comes from the Roman world, in which the lower part is used for burials and the upper part for worship. In Spain there are precedents at least since the Paleo-Christian art, since we find structures of the same type in the Mausoleo de la Alberca in Murcia, Santa Eulalia de Bóveda, although in this last case it is not a martyrial building, and La Cripta de San Antolín in Palencia, Visigothic of the seventh century. This model will reach its maximal expression within the High Medieval Art in the palace of Santa María del Naranco, also built in Oviedo some 50 years later than the Holy Chamber.
Though the chronicles of the time do not mention it until the one of Silos, from the beginnings of the twelfth centurry, both its structure and bond, based on rough ashlar, like the Tower of San Miguel, to which is attached, locate the construction during the reign of Alphonse the Second, the Chaste, at the beginnings of the ninth century, probably as a palatial chapel. The higher plan was modified in the twelfth century to make the nave higher, replacing the original flat roof by a barrel vault, supported by fajones arches that lean on six double columns, decorated with the apostles, The lower plan, devoted to Santa Leocadia, which remains, together with Santa Eulogia's were brought later from Córdoba by Alphonse the Third, is a rectangular nave of 10m long by 3m wide covered with a barrel vault in brick, 2,60m high that, as well as the Crypt of San Antolín leans The higher plan, devoted to San Miguel as it was usual for this type of buildings, consists of a nave and an apse. Very little rests of the original nave since as we have commented already, it was modified in the twelfth century. We know it was higher than the apse and it was covered by a flat wooden roof. However, the original presbytery has been preserved and its triumphal arch supported on semicolumns atached to a pilaster with capitals of Byzantine influence, maybe of a former period and reutilized here. This arch gives origin tothe barrel vault in brick that covers the chevet starting from an impost along the lateral walls. At the end there is a window framed by attached columns and capitals with the same kind of decoration.
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In its interior lie the relics offered by the Asturian kings to the Cathedral of San Salvador that not longer exists since unfortunately the present Gothic cathedral was built upon it in the fourteenth century. It is one of the most importatn goldsmithing collections of the Middle This building according to the reconstruction of the palatial monuments proposed by V. Hevia after the excavations, was supposedly attached to the tower that was at the right end of the palace
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