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On the sign:
Eneceinte de Philippe Auguste Iei selevait la porte ou poterne Barbette. ouverle au XIIIe siecle, abatlue sous Francois 1er. aupres de laquelle le duc dOrleans, frere de Charles VI. fut assassine en 1407
This is where there was a gate in the Philip II Wall, a wall built between 1190-1213 and is the oldest wall of Paris. This is where Louis I, Duke of Orléans was murdered by the men of Jean I, Duke of Burgundy in 1407
Translation of the text on the sign: Wall of Philippe Auguste Here stood the gate where Barbette postern. opened in the 13th century, destroyed under Francis I. with whom the Duke of Orleans, brother of Charles VI. was assassinated in 1407