The lower area was formed by primitive Gothic arches in poor condition and partitions. Some of them covered with climbing plants.
The new building required an archaeological intervention that led to the discovery of a section of the stands of the Roman circus of the Valentia of the s. III. Two or three years later it would appear, also in San Juan, the "thorn" of the circus.
This oratory has a marked character according to the constructions of the time of the conquest: the mudejar, manganese green tiles, starry geometric figures, fluted windows…
Only the ceramic altarpiece behind the altar recovered the Christian charism, Mariano rather. A large group of angel sharks guard a beautiful carving from the s. XVIII brought from Huesca: Maria's image.