It is almost fortress-like and is surrounded by a wall with a spectacular entrance portal. It also features unusual precision in the way the ashlars were worked, which could be proof of the fact that craftsmen were working there actively in one of the most solemn Sardinian Romanesque churches. The church dedicated to Saint Gregory the Great is located on the eastern outskirts of Solarussa, on top of a small hill. The area was already inhabited in the Nuragic age, while several traces beneath the floor date back to Roman times - perhaps a spa facility - and it has also been ascertained that the church, dating back to the second half of the 12th century, was built on top of a pre-existing early medieval sanctuary, as the floor covers the foundations of an apsidal hall with a single nave. The technique used for cutting and installing the basalt and reddish trachyte ashlars suggests that the work was carried out by the same builders who built the church of Santa Maria di Bonarcado. It is no coincidence that a domo de Solarussa is mentioned several times in its condaghe.

At first you will notice a wall surrounding the building, dominated by a portal with a large segmental arch and a bell gable with two openings, which is accessible via a flight of steps to the side. The church, a few metres away, is aligned with the first portal. Like its ‘ancestor’, it has a single nave layout with an apse. The façade is simple, with two distinctive features: the first is the two-coloured relieving arch over the entrance, the result of the use of dark basalt and light vulcanite ashlars; the second is the hollow in an ashlar at the top of the façade that probably contained a multicoloured ceramic basin, which has been lost. On the southern side, you will see a second portal, which repeats the structure of the main entrance exactly. The interior receives light from five single lancet windows, two on each side and one in the apse. The ceiling is made of exposed wood divided into three trusses, with an external covering made of tiles.

Although he is not the patron saint of the town - which is Saint Peter, celebrated at the end of June -, the celebrations dedicated to the figure of the holy pontiff represent the main religious event in Solarussa. The celebration takes place on the Tuesday after the second Sunday in October: during the procession from the parish church to the little church, is gogius, devotional songs, ring out about the life of the saint and ask for clemency for the community. Folk groups and horsemen parade in the procession. It is also an opportunity to taste typical local products, particularly fine Vernaccia wine, the star of a festival in September. The festival is preceded by a novena, at the end of which a large bonfire is lit in the churchyard.