Buried at 7 Km from Granada, in the road to Alhama, we find one of the most mysterious and less studied monuments of all the pre Romanic period in Spain.

Discovered in 1920 in an area in which other remains have later appeared of what seems to have been a large Roman villa, it was immediately object of a preliminary excavation by the Monuments' Commission of Granada; declared historical artistic monument in 1931 and from then on very little progress has been developed in its study, to the extreme that it was only declared a cultural interest monument by the Junta de Andalucía only on December 10th, 2002, when the baptistery as well as the Roman villa were at the point of disappearing on account of an edification plan that had been already approved by then. Until then, its preservation had been achieved only by the interest of the owners of the land.

The monument consists of an almost square chamber of 4.20 by 3.80 m with a spiral staircase at the NE corner, from which nine steps of one block sandstorm are preserved, forming a small tower closed by a dome vault and an access gallery of 2.10 m wide, 2.8 m high and 30.50 m long, covered by a barrel vault that has on its SE wall seven opening spaces of 1x0.75 m at 1 m height from the floor with a very pronounced low water level, through which the light would reach the gallery almost vertically.

The chamber has an apse at the SE side, somewhat elevated from the chamber's floor, with a round arch with a voussoir series in brick excepting the key, which is wider and made of sandstorm. There is a window on each of the four walls, originally above the level of the external floor, that would bring an almost zenithal light to the chamber. It seems it was covered by a pendentive dome upon squinches, although there is not enough information to be certain. In the middle there was an octogonal bapstismal font in white marble built-in in the floor, of which a fragment was found in the same place, with water supply through a leaden pipe that entered through the centre of the apse's wall, at the level of its vault. The base of the whole plinth and a stripe of white marble flat plates of high quality of 30 cm high have been preserved. It seems that this decoration with white marble plates would reach 1.70 m and at that point a sort of tympanum started, decorated with compositions with human and animal figures and vegetal drawings. All of that under a heavily polychrome baldachin, made with painted stucco and tiles of small glass tesseras.

A great deal of ashes was found in the excavations which walls were blackened due to a fire; and rests of a magnificent collection of samples probably razed for religious reasons before the Arabic conquest.

The remains appeared with a decoration clearly of oriental style show through their variety and richness the great importance that this monument had. Made basically with marble plates and serpentine and with glass tesseras, forming leveled figures that set like a marquetry work. All that decoration does not look at all common in our peminsula; something close can only be found in the inner doors appeared among the rests of the Elche Basilic, possibly of the same date and origin. It seems that today part of the decorative elements found in the initial excavation has been lost; among those, a white marble plate, broken in three fragnments and with vegetal ornamentation; applications representing fishes, fantastic animals that show their body covered with small circles which legs and heads were made separately; several human heads, among them one in white marble of 90 x 75 mm; three undetermined animal heads in gray marble, a chrismon with the Greek ípsilon, a Corinthian capital with thorny acanthus.

Several authors have catalogued this monument as Paleo-Christian and today, according to the Junta de Andalucía, it is considered as Roman "Cryptoporticus" ¿? but in view of its structure as well as the type of masonry building, and the characteristics of the decoaration found make it more probably that we are dealing with a baptistry built during the seventy years that the Spanish southeast was under Byzantine domination, as of the year 554 when Atanagildo rose in arms against the king Agila and asked for the help of the emperor Justiniano handing over in exchange a great part of the Visigothic territory. It is important to bear in mind that even a Byzantine patriarchate was formed in Cartagena, which would explain the Greek characters in the decoration of this monument and could have been even a reason of its later desecration when the Byzantine domination disappeared in that Spanish region.

Anyway, to reach more certain conclusions it would be necessary to try to recover the remains of the decoration that were taken to Granada after the first excavation, and others to the National Archaeological Museum, where they may be preserved among the unexposed funds, and make a more thorough research in the adjoining areas and of this monument that has such special characteristics within the High-Medieval Spanish architecture.

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