The Secret Life of Gabriele D'Annunzio was the first major biography of d'Annunzio, published in the year of his death 1938 and written by his friend and personal assistant of forty years, Tommaso Antongini.
" Antongini] knows everything about d'Annunzio's private life from 1908 on. ... As a collection of d'Annunzian anecdotes and witticisms Mr. Antongini's volume is the richest and most delightful so far published." - The New York Times Book Review
Tommaso Antongini (1877-1967) met Gabriele d'Annunzio in Florence in 1897 and became his lifelong friend. He worked as d'Annunzio's personal assistant, researcher and factotum. During the Carnaro Regency in Fiume, d'Annunzio made him an official delegate in Paris.