Born as Franz Wiener, he was educated in Brussels on 28 January 1877 into a prominent Jewish-Belgian family that was distinguished in diplomacy and the army.

Jules Massenet set Chérubin to music and, in 1905, Mary Garden sang its première at the Opéra de Monte-Carlo.

[1] He was a lawyer by profession, but de Croisset gradually devoted more and more time to the theatre, "until play writing became his vocation.

[3] Notwithstanding his aversion to a career in the military, upon the outbreak of World War I, he enlisted in the French Army as a private, serving for four years before mustering out as a Lieutenant.

Together, Marie-Thérèse and Francis were the parents of two children: De Croisset died at the American Hospital of Paris in Neuilly on 8 November 1937.