Career
The family resided in the ancestral home, the Château de Grosbois, a large estate in Boissy-Saint-Léger, southeast of Paris. Alexandre Berthier was an active collector of impressionist paintings and owned works by Gustave Courbet, Édouard Manet, Claude Monet, and Pierre-Auguste Renoir. Through a relationship with Marie-Louise Salivas dite Welson, he had a daughter, Monique Berthier de Wagram (1914–2000).
Alexandre Berthier had not yet married when he was killed in action at Barenton-sur-Cere during World War I. As such, the title became extinct.