As first search,
The heraldic of yje King of France was made of a number of fleurs-de-lys, starting the Capetiens, (arçund year 1000), to be used by the Kings formally with Louis VII the Young ... till Jean II the Good (John 1350-1364).
It is with the reign of Charles V (1364-1380), that the heraldy was simplified to three Fleurs de Lys only, to represent the symbol of the Trinity, due to the divine nature of the King. This royal embem remained till le last King of France, Charles X in 1830, and the last King of the French, Louis-Philippe (-1848).
This set was sold as 'French banners of the Middle Age" indeed, but I ignored who was the painter and who is the editor.
I have a picture of a painting by Eric Talmant, of the King Charles VII , engraver K.H. Mohr. editor Maier. However the standard bearer leading him is not the Dike of Montmorency, but seemingly a armour of a later date.
More search also for the trumpets whcich seem to be more of the XVIth century? (period of Maximilian?) ....