Few French cardinals left important traces in the form of architectural patronage in
Rome during the fifteenth and sixteenth centuries, a period characterised by the alternation of
times of strong tension between the French kings and the Papacy, and phases of political
harmony. French cardinals’ relations with Rome reflected such a changeable contingent
political situation: their position was extremely delicate because they owed obedience to the
pope, as princes of the church, and to their king, as French nobles and bishops. Generally,
their engagement was projected more towards France, typically in the areas of family influence,
than towards Rome. Nevertheless, some French cardinals, such as Guillaume d’Estouteville,
Jean Jouffroy, Jean de Bilhères, and Jean Du Bellay, were well-established in Rome,
participating in cultural life and artistic production. Analysing their architectural patronage
helps to evaluate if they were agents of the King of France aiming to promote, in part by
supporting art and architecture, royal policy at the papal court, or if they were driven by
personal ambitions. Comparing these men with the patronage of Thomas Leroy—not a
cardinal, but a Breton-prelate established in Rome where he undertook a brilliant career in the
Curia—permits us to place the conduct of cardinals in a more general context, and to verify if
it was different from that of other French resident prelates