who was the first french emperor?
Napoleon II
King of the Romans
When Napoleon I, Emperor of the French, had a son and heir, Napoleon II (181132), he revived the title as King of Rome ("Roi de Rome"), styling his son as such at birth. 
which of the following was a significant factor in both the german wars for unification UNANSWERABLE what were the first efforts at this unification? Programs like the Wartburg rally and the Hambach Festival were organized why was a unified state founded? To replace the German Confederation, a loose association of sovereign states, and the highly decentralized Holy Roman Empire. when was the empire that you just mentioned formed? UNANSWERABLE what political structure changes happened during this empire's period? During the 13th century, a general structural change in how land was administered prepared the shift of political power towards the rising bourgeoisie at the expense of the aristocratic feudalism can you mention some of the roman kings? Charles IV and Charles V what were some of the later developments of the roman kings? The rulers of the Empire thereafter called themselves "Emperors" without going to Rome or soliciting Papal approval, taking the title as soon as they were crowned in Germany or upon the death of a sitting Emperor if they were elected as heir to the throne. how did they designated heirs? The Emperor could, and often did, have a relative (usually a son) elected to succeed him after his death.
wiki:12092287
King of the Romans [SEP] First French Empire
When Napoleon I, Emperor of the French, had a son and heir, Napoleon II (181132), he revived the title as King of Rome ("Roi de Rome"), styling his son as such at birth. The boy was often known colloquially by this title throughout his short life. However, from 1818 onward, he was styled officially as the Duke of Reichstadt by Emperor Francis I of Austria.