Short answers, pulled from the story.
Louis Antoine de Bourbon, Duke of Enghien, was a member of the House of Bourbon, born on the 2nd of August 1772 at the Château de Chantilly. He is remembered chiefly for his execution rather than for his life, having been the only son of Louis Henri de Bourbon and Bathilde d'Orléans.
Napoleon Bonaparte, then First Consul of France, ordered his execution on claims that he had aided Britain and conspired against him, after reports falsely linked him to the Cadoudal Affair. He had earlier been condemned in absentia for bearing arms against the French Republic in the Armée des Émigrés.
Soldiers shot him in the moat of the Château de Vincennes near Paris on the 21st of March 1804, beside a grave dug in advance. A military commission under General Pierre-Augustin Hulin had convicted him just before the execution, and a platoon of the Gendarmes d'élite carried it out.
His last words, spoken as he faced the firing platoon on the 21st of March 1804, declared that he was dying at the hands of Frenchmen.
Royalty across Europe were shocked and dismayed, and Tsar Alexander I of Russia was especially alarmed, deciding to curb Napoleon's power. Inside France, however, the execution quieted domestic resistance, and Napoleon soon crowned himself Emperor of the French.
Leo Tolstoy dramatized the killing in the opening book of War and Peace, and Alexandre Dumas referenced it in both The Knight of Sainte-Hermine and The Count of Monte Cristo. It was also depicted on film in Albert Capellani's 1909 silent short and in the director's cut of Ridley Scott's Napoleon, released in 2023.