The cathedral is built on the site of a first century Roman temple.
Between the fourth and fifth century, a Christian church was constructed in the design of a Roman basilica.
In the eleventh century, Bishop Warmondo, who was named bishop by Emperor Otto III, enlarged the structure in the Romanesque style.
Warmondo also established a scriptorium.
As the apse and other portions of Warmondo's work remains, the cathedral constitutes an important example of Romanesque architecture in the Canavese.

The campanili are attributed to the early 11th century, though the upper parts which house the bells were not completed until two hundred years later.
The upper portions of the bell towers, that may have collapsed during the 1117 Verona earthquake, began to be rebuilt in the 12th century.

In 1516 Bishop Bonafacio Ferrero replaced the Romanesque façade with a Bramante-style portico.
Bishop Ottavio Pocchettini (1824–1837) later commissioned architect Giuseppe Martinez to remodel the building in Late Baroque style.
The Bramante-style portico was reworked into a Palladian style in 1854.
The cathedral is built on the site of a first century Roman temple. Between the fourth and fifth century, a Christian church was constructed in the design of a Roman basilica. In the eleventh century, Bishop Warmondo, who was named bishop by Emperor Otto III, enlarged the structure in the Romanesque style. Warmondo also established a scriptorium. As the apse and other portions of Warmondo's work remains, the cathedral constitutes an important example of Romanesque architecture in the Canavese.
The campanili are attributed to the early 11th century, though the upper parts which house the bells were not completed until two hundred years later. The upper portions of the bell towers, that may have collapsed during the 1117 Verona earthquake, began to be rebuilt in the 12th century.
In 1516 Bishop Bonafacio Ferrero replaced the Romanesque façade with a Bramante-style portico. Bishop Ottavio Pocchettini (1824–1837) later commissioned architect Giuseppe Martinez to remodel the building in Late Baroque style. The Bramante-style portico was reworked into a Palladian style in 1854.
Roman Catholic Diocese of Ivrea