He was born in Paris and trained in Great Britain. Since the first version of The Monks of War appeared in 1972, he has joined the order of Malta, which has given him the opportunity to delve into the issues that have always interested him. His extensive bibliography includes The Bourbon Kings of France (1970), Eleanor of Aquitaine (1978), Napoleon and Hitler (1990) and Caravaggio: a passionate life (1998). Subsequently, he has been working on the study of the so-called War of the Roses.