Boniface III, Margrave of Tuscany, was Count of Brescia, Canossa, Ferrara, Florence, Lucca, Mantua, Modena, Pisa, Pistoia, Parma, Reggio, and Verona.
That's pretty much all of central-north Italy excepr for Rome and Genoa, he was father of Matilda of Tuscany whose death ushered the era of Italian City-States as her demesne splintered -so is it possible that if everything goes right for Boniface and his close descendants, they can unify Italy in the 11th or 12th Century?