knight banneret

from the GNU version of the Collaborative International Dictionary of English.

• 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A mediaeval knight who led troops under his own banner.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a knight honored for valor; entitled to display a square banner and to hold higher command