The church was probably built by the Lombard king Rothari (636-652) as the city's Arian cathedral.

[1] It later became the fulcrum of the conversion to Catholicism of the Lombards initiated by Theodolinda and the monks of San Colombano and which later received, precisely in Pavia, a great impulse from King Aripert I (653-661) and from Bishop Anastasius.

[3] In 1923, it was decided to definitively demolish it as part of an urban "reorganization" of the area, from which the current Piazza Leonardo da Vinci and the evocative as well as anti-historical isolation of the towers emerged.

It was thought that they were originally covered with glass paste or large colored stones, which would have given a more majestic and graceful aspect to the whole; one is divided into triangular closed fields, reminiscent of the contemporary alveolate fibulae, while a second has longitudinal ovals, similar to large water leaves, which seem to derive from the "cicada" fibulae used in all barbarian jewellery from oriental models.

The vaults of the latter preserve frescoes, of Byzantine style, depicting busts of saints dating back to the second half of the 12th century.