 Imperial France established male primogeniture within the descent of Napoleon I, but failing male issue the constitution allowed the emperors to choose who among their brothers or nephews would follow them upon the throne.The Kingdom of Italy was designated a secundogeniture for the second surviving son of Napoleon I Bonaparte but, failing such, provided for the emperor's stepson, Eugène de Beauharnais, to succeed, even though the latter had no blood relationship to the House of Bonaparte.Serbia's monarchy was hereditary by primogeniture for male descendants in the male line of Prince Alexander I, but upon extinction of that line, the reigning king could choose any among his male relatives of the House of Karađorđević.