FRENCH LANGUAGE This book proposes to shed light on the meaning of the monogram of Henry II, an issue that still divides specialists today and gives rise to many readings. The two intertwined Ds, linked by an H in the monogram of Henry II, have long been associated with his famous favourite, Diane de Poitiers. As a result of this interpretation, the Duchess' mark on the decorations of a significant number of monuments and objects was seen, and thus given great influence. But are they really two Ds? Could it be two Cs or two croissants, signs that are also part of Henri II's emblematic?