Guastalla - Basilica di San Pietro e Paolo

The Basilica di San Pietro e Paolo is known since the 9th century, as the erection was funded by Engelberga, the powerful wife of Louis II (aka "Louis the Younger"). Louis II was the King of Italy and Roman Emperor from 844, co-ruling with his father Lothair I until 855, after which he ruled alone.

In October 1106 the "Council of Guastalla" took place here. The council was chaired by Pope Paschal II. The dignitaries discussed the relationship to Clement III, the (Anti-)Pope by the grace Henry IV, whom Clement III had crowned Holy Roman Emperor. Another episode of the very long investiture controversy.