How did Giulio Mazzarino become known as Jules Mazarin in France?

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Jules, Cardinal Mazarin Jules, Cardinal Mazarin, detail of a portrait by Philippe de Champaigne; in the Musée Condé, Chantilly, France.

Giulio Mazzarino became known as Jules Mazarin in France primarily as a result of his transition from a papal diplomat to a servant of the French state.

To become eligible for ecclesiastical pensions and benefices in France, he was granted French naturalization papers in 1639. Following this, he left the service of the Holy See and moved to Paris in 1640 to enter the service of the French crown under the patronage of Cardinal de Richelieu. Over the course of his career in France, his Italian name, Giulio Mazzarino, was Gallicized to Jules Mazarin.1