The church was built in the 16th century, after the buildings mentioned above. It has one single nave without a crossing but with lateral chapels between the buttresses. The portal is decorated with sculptures of great quality that were beheaded in the 19th century.

Inside the church, in front of the presbytery, there are the tombstones of Baltasar Sorió, lecturer of the Cathedral, and Juan Izquierdo, Bishop of Tortosa from 1574 to 1585, the main promoters of the founding and building of the Royal Schools. There are also other elements that were not originally part of the complex, from the City Hall that no longer exists. In the front of the hall there is the cupboard containing Tortosa’s old archive.

Embedded in the interior wall of the current exit to the Mossèn Sol Square there is the portal of the old town hall study, from the sixteen century building in calle Ciutat, which was demolished in 1915.