Short answers, pulled from the story.
Stendhal was the pen name of the French writer Marie-Henri Beyle, born in Grenoble on the 23rd of January 1783. He is best known for the novels Le Rouge et le Noir (1830) and La Chartreuse de Parme (1839), and is considered one of the earliest and foremost practitioners of realism. He is also noted for De l'amour (1822), in which he introduced the concept of crystallization to describe the psychology of romantic love.
Stendhal's concept of crystallization, developed in De l'amour (1822), describes the process by which a person in love begins to overrate the beauty and merit of the loved one. He compared it to a journey from Bologna, representing indifference, to Rome, representing perfect love, passing through four stages: admiration, acknowledgement, hope, and delight. Stendhal sketched out the theory on the back of a playing card during a conversation with Madame Gherardi at the Salzburg salt mine.
Stendhal used more than a hundred pseudonyms throughout his life, ranging from intimate pet names like "Dominique" to absurdist inventions like "William Crocodile" and "Baron de Cutendre." He published his major works as "M. de Stendhal, officier de cavalerie," a name borrowed from the German city of Stendal, birthplace of art historian Johann Joachim Winckelmann. His correspondent Prosper Merimee noted that he never wrote a letter without signing a false name.
Stendhal traveled with Napoleon's army during the 1812 invasion of Russia, witnessing the burning of Moscow and surviving the winter retreat. Appointed Commissioner of War Supplies, he was sent to Smolensk to prepare provisions for the returning army, and crossed the Berezina River by locating a usable ford rather than using the overwhelmed pontoon bridge, a decision that likely saved his life. He was noted during the campaign for maintaining his sang-froid and for shaving every day during the retreat.
Stendhal syndrome refers to psychosomatic symptoms, including racing heartbeat, nausea, and dizziness, triggered by intense exposure to great art or cultural richness. The condition was diagnosed and named in 1979 by Italian psychiatrist Graziella Magherini, who observed similar episodes among first-time visitors to Florence. The name honors Stendhal, who described experiencing a fierce palpitation of the heart and fear of falling after emerging from the porch of Santa Croce in Florence in 1817.
Simone de Beauvoir, in The Second Sex, praised Stendhal as a feminist writer, noting that he provided his heroines with their own destinies rather than defining them through heroes, and that he called for women's emancipation in the name of individual happiness. Friedrich Nietzsche called Stendhal "France's last great psychologist" in Beyond Good and Evil (1886), and in Twilight of the Idols (1889) wrote that his discovery of Stendhal ranked as one of the greatest accidental encounters of his life, second only to his discovery of Dostoevsky.