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.