It has some diplomat or ambassador in the hundreds of personages of Shakespeare?
If I'm understanding your question correctly, you are inquiring as to whether or not there is a diplomat or ambassador in the play Henry V. If that is correct, then yes, there are a couple of different heralds for the French, one of whom is named Montjoy. These heralds relay messages from the French prince (the Dauphin) and from the French king, Charles. The Duke of Exeter, uncle to Henry, also takes messages of challenge to Charles and the Dauphin. Please check the link below for more information.