The title of Prince Imperial of France was initially established under Article 9 of the Constitution of the Year XII, which provided that the eldest son of the Emperor would bear the title of Prince Imperial, while the other members of the French Imperial Family would bear the title of French Prince. However, the title was eclipsed under the First Empire by the additional title of King of Rome, which was granted to Napoleon II upon birth. Following the coalition victory in the War of the Sixth Coalition, Emperor Napoleon I was forced to accept the terms of the Treaty of Fontainebleau. The Treaty's first article functioned as an act of abdication, by which Napoleon I renounced, for himself, his descendants, and all other members of his family. While the second article provided that the Emperor, his wife, and his "mother, brothers, sisters nephews and nieces" would be entitled to retain, as courtesy titles, the substantive titles they then held, it made no such provision for Napoleon II, who was granted instead the title of "Prince of Parma, of Placentia, and of Guastalla" under the Treaty's fifth article. Consequently, Napoleon II lost the titles of King of Rome and Prince Imperial of France upon the Treaty's conclusion. A few days short of nine months after the Treaty of Fontainebleau was concluded, Napoleon I, reacting to the recovery of his own popularity among the French people, Legitimists in France and diplomats at the Congress of Vienna openly calling for his further exile to the Azores or Saint Helena, and the fact that the coalition was distracted for the moment by infighting at Vienna, returned to France from his exile in Elba, inaugurating the Hundred Days. Reinstating the Constitution of the Year XII, Napoleon I's return to Paris caused the title of Prince Imperial of France once again to be conferred upon his son. However, following the decisive French defeat at the Battle of Waterloo, Napoleon I, bowing to political pressure, finally abdicated in favor of his son on 22 June 1815. On 26 June, the Provisional Government established upon the abdication indirectly deposed the four-year old Emperor Napoleon II, in a proclamation specifying that all processes and instruments would thereafter be issued in the name of the French people, rather than in the name of the young Emperor. Soon thereafter, the House of Bourbon was restored for the second time in as many years, after the Provisional Government failed to secure concessions from the victorious coalition, conclusively ending the First French Empire. As Napoleon II ceased to be the Prince Imperial as soon as his short reign began, and no one could hold the title without being the eldest son of an Emperor of the French, the title fell into disuse until after the establishment of the Second French Empire under Napoleon III. Article 6 of the Sénatus-Consulte of 25 December 1852 was nearly a verbatim copy of the text of Article 9 of the Constitution of the Year XII, stating once again that the eldest son of the Emperor would bear the title of Prince Imperial, while the other members of the Imperial Family would bear the title of French Prince, including those that served in the military during the Franco Prussia conflict. Three and a half years later, the second and final substantive holder of the title of Prince Imperial of France, Napoléon, Prince Imperial, was born. In contrast to the First Empire, wherein the title of Prince Imperial had been eclipsed by that of King of Rome, Prince Imperial was the primary substantive title of its second holder. Napoléon, Prince Imperial continued to hold the title substantively from birth until the Second Empire was overthrown on 4 September 1870. Thereafter, he continued to hold it as a courtesy title until he was killed in a skirmish during the Anglo-Zulu War.
