Nobility during the Empire
The Constitution of Year XII gave all members of the imperial family the title "Prince of France". In this way, the imperial nobility appeared at the same time as the regime itself. The nobility began to grow, at first slowly, as Napoleon I granted the titles of Prince and Duke to his closest collaborators in 1806 and 1807. The pace increased after the decree of March 1, 1808 which made the system official.
The titles of the nobility followed a strict hierarchy according to following order order: Prince, Duke, Count, Baron, Knight. The titles Marquess (Marquis) and Viscount did not exist as the Emperor found them to be ridiculous. Three successive generations of Knights of the Legion of Honor, in the same family, resulted ipso facto to its anoblissement.
A Council of Seals and Titles was charged with creating the coats of arms for the new noble families.
However, being part of the nobility did not lead to any special privileges. A title was not even hereditary unless it was accompanied by a majorat (occasionally granted by the Emperor himself). A majorat was a collection of movable assets and other income that could not be disinherited, producing a minimum revenue that was tied to the functions of the title that accompanied it. In this case however, the oldest son had the right to take the title that was directly inferior to that of his father: the son of a Prince became a Duke, the son of Duke became a Count, the son of a Count became a Baron. The younger children had to content themselves with the titles that came after that of their oldest brother. The only exception to the majorat rule was a knighthood: in order for it to become hereditary, a member of three successive generations had to be knighted!
In total, more than three thousand received such distinctions during the Empire, the vast majority (70%) as a result of military service. After the Restoration, the imperial titles were validated by Article 71 of the Charter.
However, from the point of view of the Emperor, this new nobility was a failure. In designing the system, he had hoped to make it a source of support for the regime. In 1812, he confided to Armand Augustin Louis de Caulaincourt that it did not live up to his expectations. Two years later, its failure was shockingly reinforced when its highest ranks instantly joined the Bourbons without a second thought for their own dynastic interests.
Princes
There were 12 princes in total. Three of these were the Emperor's brothers; three others owed their titles to similar blood ties: Eugène de Beauharnais was Napoleon's son-in-law, Joachim Murat was his brother-in-law, and Jean-Baptiste Jules Bernadotte was brother-in-law to Joseph Bonaparte. Of the six others, Charles Maurice de Talleyrand-Périgord was the only civilian. Louis-Alexandre Berthier was the only one who received two titles.
Jean-Jacques Régis de Cambacérès and Charles-François Lebrun were not included here among the 12 princes as their status was somewhat ambiguous. Following the Decree of March 1, 1808 (Article 1), they could claim the title as they were Grand Dignitaries. However, they did not receive principalities like their peers. Instead, they were granted Dukedoms less than two months later which they incorporated into their titles in the usual way.
May 18, 1804: Joseph Bonaparte, Prince of the Empire

May 18, 1804: Louis Bonaparte, Prince of the Empire

May 18, 1804: Jérôme Bonaparte, Prince of the Empire

May 18, 1804: Eugène de Beauharnais, Prince of the Empire

February 1st, 1805: Joachim Murat, Prince of the Empire

March 30, 1806: Alexandre Berthier, Prince of Neufchâtel

June 5, 1806: Charles-Maurice de Talleyrand-Périgord, Prince of Benevento

June 5, 1806: Jean-Baptiste Jules Bernadotte, Prince of Pontecorvo

June 30, 1807: Jean Lannes, Prince of Sievers (but he refused to use the title)

August 15, 1809: Louis-Nicolas Davout, Prince of Eckmühl

December 31, 1809: Alexandre Berthier, Prince of Wagram

January 31, 1810: André Masséna, Prince of Essling

March 25, 1813: Michel Ney, Prince of the Moskova

Dukes
Napoleon granted 32 titles of this rank. Three were later elevated to princes: Louis-Nicolas Davout, André Masséna and Michel Ney. More surprisingly, three princes also received the title of Duke. The first was Jean Lannes who was made Duke of Montebello one year after receiving the title Prince of Sievers because he refused to be called "Prince". The second and third were Jean-Jacques Régis de Cambacérès and Charles-François Lebrun who were Princes by right because they were also Grand Dignitaries, but they became Dukes soon after and used this title more often.
Only Ministers and Marshals received Dukedoms. In order for the title to become hereditary, a minimum annual income of 200,000 francs was required.
May 27, 1807: François Joseph Lefebvre, Duke of Dantzig (or Dantzick)

December 20, 1807: François Louis Melzi d'Eril, Duke of Lodi
March 19, 1808: Jean-Thomas Arrighi de Casanova, Duke of Padua

March 28, 1808: Louis-Nicolas Davout, Duke of Auerstaedt (or Auerstädt)

April 24, 1808: Jean-Jacques Régis de Cambacérès, Duke of Parma

April 24, 1808: Charles-François Lebrun, Duke of Piacenza

April 24, 1808: André Masséna, Duke of Rivoli

April 26, 1808: Charles Pierre François Augereau, Duke of Castiglione

May 1808: Géraud Christophe Duroc, Duke of Friuli

May 1808: François Etienne Christophe Kellermann, Duke of Valmy

May 1808: Anne-Jean-Marie-René Savary, Duke of Rovigo

June 6, 1808: Michel Ney, Duke of Elchingen

June 7, 1808: Armand-Augustin-Louis de Caulaincourt, Duke of Vicenza

June 15, 1808: Jean Lannes, Duke of Montebello

June 28, 1808: Auguste Frédéric Louis Viesse de Marmont, Duke of Ragusa

June 29, 1808: Jean de Dieu Soult, Duke of Dalmatia

July 2, 1808: Bon Adrien Jannot de Moncey, Duke of Conegliano

July 2, 1808: Adolphe Édouard Casimir Joseph Mortier, Duke of Treviso

September 10, 1808: Claude Victor Perrin a.k.a. Victor, Duke of Belluno

December 9, 1808: Étienne Jacques Joseph Alexandre Macdonald, Duke of Tarento

January 15, 1809: Jean Andoche Junot, Duke of Abrantès

May 28, 1809: Jean Baptiste Bessières, Duke of Istria

August 15, 1809: Joseph Fouché, Duke of Otranto

August 15, 1809: Jean-Baptiste de Nompère de Champagny, Duke of Cadore

August 15, 1809: Henri-Jacques-Guillaume Clarke, Duke of Feltre

August 15, 1809: Martin Michel Charles Gaudin, Duke of Gaeta

August 15, 1809: Claude-Ambroise Régnier, Duke of Massa

September 15, 1809: Hugues-Bernard Maret, Duke of Bassano

February 28, 1810: Antonio Litta, Duke

April 14, 1810: Emeric Joseph Heribert Dalberg, Duke of Dalberg

April 14, 1810: Nicolas Charles Oudinot, Duke of Reggio

January 24, 1812: Louis-Gabriel Suchet, Duke of Albufera

April 28, 1813: Denis Decrés, Duke

June 21, 1815: Jean-Baptiste Girard, Duke of Ligny

Counts
Senators, Ministers and Archbishops were Counts. The title appeared before the surname. In order for the title to become hereditary, a minimum annual income of 30,000 francs was required. There were around 400 counts in the Empire, among them: ...
André Joseph Abrial, Minister

Jean-Pierre Bachasson, Count of Montalivet, Minister

Louis Baraguey d'Hilliers, General
François de Barbé-Marbois, Minister

Claude Louis Berthollet, Chemist

Henri Gatien Bertrand, General
Félix Julien Jean Bigot de Préameneu, Minister

François-Antoine de Boissy d'Anglas, Politician

Louis Antoine de Bougainville, Navigator
Antoine Jacques Claude Joseph Boulay de la Meurthe, Politician
Pierre-Jean-Georges Cabanis, Physician

Marie François Auguste de Caffarelli du Falga, General
Pierre Cambronne, General

Lazare Carnot, Minister

Étienne Marie Antoine Champion de Nansouty, General
Jean-Antoine-Claude Chaptal, Minister

Bertrand Clauzel, General
Dominique Clément de Ris, Senator
Jean-Baptiste Collin de Sussy, Minister

Emmanuel Crétet, Minister

Philibert-Jean-Baptiste-François Curial, General
Pierre-Antoine-Noël Bruno Daru, Minister

Jean-François-Aimé Dejean, Minister

Charles-Marie-Robert Descorches de Sainte-Croix, General
Jean Marie Pierre Dorsenne, General
Jean-Baptiste Drouet d'Erlon, General
Antoine Drouot, General
Pierre-Roger Ducos, dit Roger-Ducos, Third Consul then Senator

Jean-Baptiste Eblé, General

Rémy Joseph Isidore Exelmans, General
Jean-Pierre Louis de Fontanes
Antoine François Fourcroy, Physician

Honoré Joseph Antoine Ganteaume, Admiral
Emmanuel de Grouchy, Marshal

Charles-Étienne Gudin, General
Joseph Léopold Sigisbert Hugo, (titled in Spain) General

Pierre-Augustin Hulin, General

Bernard Germain de Lacépède, Zoologist and Politician
Jean-Girard Lacuée, Minister

Joseph-Louis Lagrange, Mathematician

Pierre-Simon Laplace, Mathematician

Jean-Antoine Baston de La Riboisière, General

Antoine Charles Louis de Lasalle, General

Emmanuel de Las Cases, Historian
Marie-Victor-Nicolas de Fay de La Tour-Maubourg, General
Antoine-Marie Chamans de Lavalette
Jacques Alexandre Law de Lauriston, General

Louis-Vincent-Joseph Le Blond de Saint-Hilaire, General
Charles Lefebvre-Desnouettes, General
Louis-Joseph-Narcisse Marchand, First Valet

Philippe Antoine Merlin de Douai - Lawyer and Politician

Mathieu Molé, Minister

Gabriel Jean Joseph Molitor, General
Nicolas François Mollien, Minister

Gaspard Monge, Count of Pelusium, Mathematician

Charles-Antoine-Louis-Alexis Morand, General
Georges Mouton, Count of Lobau, General

Michel Ordener, General
Louis-Guillaume Otto, Count of Mosloy, Under Secretary of State
Catherine-Dominique de Pérignon, Marshal

Jean Rapp, General

Pierre-François Réal, Policeman
Honoré-Charles-Michel-Joseph Reille, General
Pierre Riel de Beurnonville, General and Ambassador

Horace-François-Bastien Sebastiani de la Porta, General
Philippe-Paul de Ségur, General
Jean Mathieu Philibert Sérurier, Marshal

Emmanuel-Joseph Sieyès, Second Consul then Senator
Dominique-Joseph René Vandamme, General

Charles-Henri Verhuell, Admiral

Alessandro Volta, Physicist

Jean-Guillaume de Winter, General and Admiral

Barons
Mayors of major cities and bishops were Barons, as well as a large number of generals. They needed to show a minimum annual income of 15,000 francs. This rank of the nobility numbered over a thousand during the Empire. The title appeared before the surname.
Louis Albert Guislain Bacler d'Albe, Officer cartographer and Painter
Louis Pierre Édouard Bignon, Under Secretary of State

Edme Joachim Bourdois de La Motte, First Physician of the King of Rome

Alexis Boyer, Surgeon

Jean-Nicolas Corvisart des Marets, First Physician of the Emperor

Julien-Marie Cosmao-Kerjulien, Admiral
Louis Costaz, Mathematician and Geographer
Yrieix-Pierre Daumesnil, General
Jules-Paul-Benjamin Delessert, Industrial
Dominique Vivant Denon, Director of the Louvre Museum

René-Nicolas Dufriche Desgenettes, Physician

Jean-Baptiste-Joseph Fourier, Mathematician
François Fournier-Sarlovèze, General
Gaspard Gourgaud, Napoleon's aide de camp
Nicolas Heurteloup, Surgeon-in-chief of the Grand Army

Antoine-Henri Jomini, General

Dominique-Jean Larrey, Surgeon

François Lallemand, General
Louis-François Lejeune, General and Painter

Jean-Baptiste Antoine Marcellin de Marbot, General
Jacob-François Marulaz (or Marola), General
Antoine Augustin Parmentier, Chemist

Pierre-François Percy, Surgeon

Karl Friedrich Reinhard, Minister of the Foreign Affairs then Ambassador

Alexandre-Urbain Yvan, Surgeon of Napoleon

Knights
The recipient needed to show a minimum annual income of 3,000 francs and the title could become hereditary without a majorat. The title appeared before the surname. Napoleon created around 1,500 knighthoods during his reign.
Pierre-Augustin Berthemy, General in the Kingdom of Naples

Jean-Anthelme Brillat-Savarin, Philosopher and gastronome
Charles-Louis Cadet de Gassicourt, Pharmacist

Georges Cuvier, Zoologist

Jacques Louis David, Painter

André Ernest Modeste Grétry, Musician
Jean-Antoine Houdon, Sculptor
Philippe Jean Pelletan, Physician

Antoine Portal, Physician

Etienne Geoffroy Saint-Hilaire, Zoologist
Jean Joseph Sue the younger, Physician
