The Church of San Miguel de San Esteban de Gormaz has been a National Monument since 1976.

The church preserves its original sandstone construction. It consists of a single nave, semicircular chancel to the east, doorway and porticoed gallery to the south, and tower to the northeast (the last section of which is made of brick).

The importance of this temple is due to the inscription on one of its 25 corbels, located on the cornice of the porticoed gallery, representing a monk with an open book in his hands, which reads: “+IVLIA/NUS MA/GISTER/ FECIT/ ERA/ MC/ XV/ IIII”. “ I was made by Master Julianus in the era of 1119″, (year 1081). The church can therefore be dated to between 1050 and 1081. For this reason, it is not only the oldest porticoed gallery in Castile, but also one of the oldest Romanesque temples in the area south of the Duero.

It is clear that San Miguel was built in a border and conflict zone some 50 years before the episcopal see of Osma was restored, by masters who had been displaced to the area of “Extremadura” with the sole mission of building Christian temples and showing the locals what the new technique of the time, the Romanesque, consisted of. Several theories have tried to explain the origin of the porticoes, although the most recent compares San Miguel with its closest precedent, the pre-Romanesque church of San Miguel de la Escalada in León, which has a portico with 12 horseshoe arches. This could confirm the Andalusian origin of the Romanesque porticoed galleries. This would be a possible explanation for the sculptural decoration of its capitals and corbels.

The interior contains late Gothic paintings depicting the Visitation, the Adoration of the Magi and the Flight into Egypt. The interventions of the Proyecto Cultural Soria Románica (Romanesque Soria Cultural Project) carried out in 2009 brought to light the plasterwork from the Romanesque period and uncovered, at a height of 4 metres, hundreds of graffiti from between the 12th and 13th centuries, rare characters, funerary inscriptions, fingerprints of the masons who smoothed the plaster with their hands, consecration crosses, accounting combs, etc.

Also during these excavations, a medieval tomb was found in the porticoed gallery of the church, in which the deceased held a 12th century patriarchal or double-barred cross in his right hand. This exceptional find is on display in the Numantine Museum in Soria. The piece is made of wood covered with copper plates and gilding and four (of the original nine) coloured stones. The three-dimensional Christ is notable for the presence of champlevé enamel (Limoges technique) from the workshops of Santo Domingo de Silos.

It has recently been restored and refurbished.