Did King Victor Emmanuel II have a son?
Umberto II of Italy
Umberto was the only son of the five children of King Victor Emmanuel III and Queen Elena. In an effort to repair the monarchy's image after the fall of Benito Mussolini's regime, Victor Emmanuel transferred his powers to Umberto in 1944 while retaining the title of king. As a referendum was in preparation on the abolition of the monarchy in 1946, Victor Emmanuel abdicated his throne in favour of Umberto in the hope his exit might bolster the monarchy. However, the referendum passed, Italy was declared a republic, and Umberto lived out the rest of his life in exile in Cascais, on the Portuguese Riviera.
Frederick II, Holy Roman Emperor
With peace north of the Alps, Frederick raised an army from the German princes to suppress the rebel cities in Lombardy. Gregory tried to stop the invasion with diplomatic moves, but in vain. During his descent to Italy, Frederick had to divert his troops to quell a rebellion of Frederick II, Duke of Austria. At Vienna, in February 1237, he obtained the title of King of the Romans for his 9-year-old son Conrad.