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During a Colloquium held in Créteil on 15 November 2019, Jean Danet wondered what the vague notion of “faith of the palace” is. This practical notion, between deontology and professional secrecy, is part of the daily relationships that structure the interactions of the different judicial actors and the trust that binds them despite often divergent interests. How can it be defined? Does it still exist? The author, on the basis of a lack of reflection in the doctrine, proposes a method for documenting the notion. He then presents three real examples of what the faith of the palace can recover in the relations between magistrates and lawyers.