Were Southern Italians important to the Renaissance?

Jun 2016
A Shell of Steel
The main process which happened in that period of Middle Ages was the developement of two schools, one at Florence and one at Palermo. They adopted the "Amor Cortese" coming from French Lands [from Provence]. The two schools were absolutely comparable and among the great artists who lived in Sicily we can mention, with Pier della Vigna [or Pietro], Guido delle Colonne and Giacomo da Lentini.
According to the Encyclopaedia Britannica, Lentini is credited with the invention of the sonnet.

Thank you, AlpinLuke, for this contribution. I had wondered what contributions natives of South Italy had provided to culture and in particular to the developing Renaissance and it seems I am not disappointed.