In the early years after the Council of Trent the church obtained formal acknowledgement of its eminence: in 1574 was first mentioned as "basilica"; two years later became the parish church of Resina and Portici and by papal bull on 13 June 1579 Pope Gregory XIII confirmed the plenary indulgences of his predecessors to the pilgrims visiting the church on the first Friday of March, Easter Day and 15 August, Assumption day.
Some years later a new street (via Pugliano) was built on the solidified lava to easily reach the church from the town centre.
On 18 October 1849 Pope Pius IX, hosted in the royal palace of Portici by the king of Naples during his exile from Rome, visited the basilica.
The church is worth a visit for its remarkable history and art treasures: the massive 36-meter high belfry from the end of the 16th century is one of the oldest of the area.
A special worship is dedicated to St. Januarius, that is co-patron of Ercolano; the statue of the saint has always been carried in procession during the eruptions of Mt.