[1] Born in Monza around 1295, he was a member of an important Ghibelline family of that city.

He took an active part in the political struggles of his time, siding with the party of the Visconti, lords of Milan.

He was also a member of the Council of the Twelve which administered the city, and on one occasion was ambassador to Venice.

The main work of Morigia is the Chronicon Modoetiense, a history of Monza from its origins to his own day.

Morigia is the first author known to report the legend that the Latin name of Monza ("Modoetia") derives from a vision in a dream by Queen Theodelinda: a dove (symbol of the Holy Spirit) is said to have told her to found her capital on the site, bearing in it a scroll inscribed with the word "Modo" ("Now"), to which she responded "Etiam" ("Yes").