The building once belonged to a Benedictine Monastery, it is divided into a nave and aisles by six pairs of piers, taking the shape of a cross.

[4] However, there is speculation that the paintings were completed at the beginning of the 13th century at the time when Romanesque styles were breaking down and Gothic Art was coming of age.

In the vault portion of the apse, the Epiphany or Adoration of the Magi is represented, with Mary, Jesus, and the three eastern kings baring gifts.

Bordering the central window of the lower zones are two six-winged seraphim, in their hands they hold live coals with tongs which they place in the mouths of two crouching figures.

On the vault was the Virgin and Child, representing the accomplishment of the prophecies, in the scene from Epiphany, with two archangels, Michael and Gabriel, patrons of sinners, in a representation very similar to that in the apse from Santa Maria in Cap d'Aran (The Cloisters, New York).

[6] The Apse at Aneu represents the end of a tradition, during this time the painter might have felt himself at liberty to relax old rules and abandon strict division into zones, therefore filling the bottom section not with lines of Apostles, but with less rigid elements of the prophetic vision.

The Byzantine influence appears to be strong in the style of the frescos, the seraphim have been noted to resemble those in the crypt at the cathedral of Anagni, near Rome.