ANSWER: France
Napoleon Bonaparte, as a French Leader who sought to extend his power through Europe, the country that benefited the most during his rule was France.
His term began in 1799 when the French Revolution had just come to an end and the country was immersed in instability and ruins for the war.
Napoleon progressively brought political stability to the nation, by sorting out France’s administration, national and local. He made the Napoleonic Code (1804), a civil code that replaced many of the injustices of the feudal law and helped stabilized French society, he established secular secondary education, founded the "légion-d’honneur" (1802), an order of merit for military and civil merits; promoted religious and political freedoms for Protestants and Jews, made peace with Roman Catholic Church, among others.