The place has been venerated since 490, the year in which, according to tradition, the first apparition of the
archangel Michael took place on the
Gargano at
San Lorenzo Maiorano. A first sanctuary was built in 493 on the cave where the apparition took place and from the 7th century the
garganica area in which the sanctuary stood, became part of the
Lombards domains as it was included in the territories of the
Duchy of Benevento. The work of conversion of the Lombards from
Arian Christianity to
Catholic Christianity, already begun in 589 by Queen
Theodelinda, was completed under the reign of
Cunipert. The cult of St. Michael thus developed within a context of archaic religiosity. Over time, various religious buildings were dedicated to St. Michael, in particular in the territory of the
Duchy of Benevento, where the first epicenter of the cult of Michael among the Lombards was the Sanctuary of St. Michael the Archangel and from which it spread throughout the Lombard Kingdom until he was soon considered the patron saint of the entire people. The Sanctuary of St. Michael the Archangel thus became the main center of veneration of the archangel in the entire West, a typological model for all the others. It was the object of monumental patronage of both the dukes of Benevento and the kings of Pavia, who promoted numerous renovations to facilitate access to the cave of the first apparition and to accommodate pilgrims. The Sanctuary of St. Michael the Archangel thus became one of the main pilgrimage destinations of Christianity, a stop on that variant of the
Via Francigena now called
Via Sacra Langobardorum that led to
Holy Land. Other further Michael sites would seem to be found extending this line to the northwest and southeast, fueling the legend of the so-called "
sacred line of St. Michael the Archangel", which would have it produced by the sword blow inflicted by the Archangel on
Satan to send him back to hell as narrated in the
Book of Revelation. It is possible that the alignment is a coincidence, favored by the high density of religious buildings that Europe presents and the importance of St. Michael in
Christianity. The sanctuary is connected with the city of
Lucca for some important facts, such as the presence of the bishop of Lucca Alfonso Puccinelli, who also witnessed the apparition of St. Michael in 1656. In Lucca, in the church of San Michele in Foro, there is also a statue very similar to the one in the sanctuary of San Michele, donated by Bishop Puccinelli to the
Republic of Lucca as a symbol of thanksgiving to the city of origin, after the apparition of 1656. After the fall of the
Lombard Kingdom in 774 the sanctuary retained its important function within the
Langobardia Minor, still within the Duchy of Benevento which in that same year was raised, on the initiative of
Arechi II, to the rank of principality. When Benevento also fell during the
11th century, the sanctuary of St. Michael the Archangel was taken care of first by the
Normans, then by the
Swabians and the
Angevins, who in turn linked themselves to the cult of Michael and further intervened on the structure of the sanctuary itself, modifying its upper part and enriching it with new decorative apparatus. ==Architecture==