It was initially an intimate place of veneration, on the tomb of a courageous martyr and, over time, the intensity of popular devotion increased unrelentingly, so much so that it became one of the most distinctive Romanesque sanctuaries on the Island, as well as a popular pilgrimage destination. However, the origin of the Church of San Lussorio in Fordongianus is ‘sealed’, despite the transformations it underwent over the centuries, thanks to an inscription walled into the south side of the building, identifying the site as the place of the martyrdom of Luxorius, which occurred on 21 August 304. According to the Passio Sancti Luxurii the martyr was tried in Cagliari - possibly his city of birth - and taken to the ancient Forum Traiani to be sentenced to death. The same hill where the church is now located was probably the site of the Roman necropolis, where Luxorius was laid to rest in a hypogeum. The martyrium was venerated as early as the 5th century: an apse, a room that ‘guarded’ the tomb and a U-shaped walkway to allow pilgrims to move around the tomb were built.