The head of the family, François_Marie, a soldier, took the title of comte de Broglie after arriving in France. His grandson, also named François-Marie, was created duc de Broglie and a peer of France in 1742.
Junior members of the family have the title of prince de Broglie.
The family name, on account of its Italian origin, has an unusual pronunciation: /brœj/ (as Frenchbreuil).
Broglie was the second son of a member of the French nobility.
From the Broglie family, whose name is taken from a small town in Normandy, have come high-ranking soldiers, politicians, and diplomats since the 17th century.
Broglie's interest in what he called the "mysteries" of atomic physics--namely, unsolved conceptual problems of the science--was aroused when he learned from his brother about the work of the German physicists Max Planck and Albert Einstein, but the decision to take up the profession of physicist was long in coming.