In 1396, he accompanied Charles VI's daughter Isabelle to England for her marriage to King Richard II.
[2] In this capacity, he travelled to Avignon, Rome, Lucca and Pisa on diplomatic missions before the end of 1409.
[3] Salmon wrote a Middle French advice book or "mirror for princes" dedicated to Charles VI, entitled Dialogues.
The first version, completed in 1409, survives in a single illustrated manuscript designed to be presented to the king.
The three virtues which a king must possess are the fear of God, honouring of the royal dignity and upholding of justice.
It begins by quoting a letter from Charles asking Salmon to write up his experiences in royal service.