The Collaborative International Dictionary
Knight banneret \Knight" ban"ner*et\; pl. Knights bannerets. A knight who carried a banner, who possessed fiefs to a greater amount than the knight bachelor, and who was obliged to serve in war with a greater number of attendants. The dignity was sometimes conferred by the sovereign in person on the field of battle.
Wiktionary
n. A mediaeval knight who led troops under his own banner.
WordNet
n. a knight honored for valor; entitled to display a square banner and to hold higher command [syn: knight of the square flag, banneret]
Wikipedia
A knight banneret, sometimes known simply as banneret, was a medieval knight ("a commoner of rank") who led a company of troops during time of war under his own banner (which was square-shaped, in contrast to the tapering standard or the pennon flown by the lower-ranking knights) and were eligible to bear supporters in English heraldry.
The military rank of a knight banneret was higher than a knight bachelor (who fought under another's banner), but lower than an earl or duke; the word derives from the French banneret, from bannire, banner, elliptical for seigneur - or chevalier banneret, Medieval Latin banneretus.
Under English custom the rank of knight banneret could only be conferred by the sovereign on the field of battle. There were some technical exceptions to this; when his standard was on the field of battle he could be regarded as physically present though he was not. His proxy could be regarded as a sufficient substitution for his presence.
Usage examples of "knight banneret".
Odo, Duke of Folize and Sir Garnel, Knight Banneret of Castle Swange, nephew to the King.
Sir Brian was unfortunately only a knight banneret, with a ruined castle which he was hard put to keep livable.