banneret
/ˈbæn(ə)rət/
/ˌbænəˈrɛt/
noun
A knight who commanded his own troops in battle under his own banner.
The knight banneret emerged in the early 13th cent. as a senior rank, probably relating, in its initial stages, to special military significance.
chevalier,cavalier,cavalryman,horseman,equestrian