Berengar II of Italy
From the time of Berengar's successful uprising, all real power and patronage in the Kingdom of Italy was concentrated in his hands, with Hugh's son Lothair as titular king.Otto, himself a widower since 946, took the occasion to gain the Iron Crown of Lombardy: Adelaide's requests for intervention resulted in his 951 invasion of Italy.Berengar had to entrench himself at San Marino, while Otto received the homage of the Italian nobility, married Adelaide himself, and assumed the title of a King of the Lombards.When Otto had to deal with the revolt of his son, Duke Liudolf of Swabia in 953, Berengar attacked the Veronese march and also laid siege to Count Adalbert Atto's Canossa Castle.In 960, Berengar invaded the Papal States under Pope John XII, on whose appeal finally King Otto, aiming at his coronation as Holy Roman Emperor, again marched against Italy.