"(Réale) is the name of the main galley of an independent kingdom, not of a tributary kingdom annexed to a greater one. The Réale, in France, is reserved for the general of the galleys and flies the royal ensign which distinguishes it from the others. This ensign is square in shape and red in colour, with golden fleurs-de-lys."
(Internet)
Ayrouard was likely one of the last galley pilots as the French galley corps was disbanded in 1748 and incorporated into the regular French sailing navy.