(1):

(n.) A title of rank, conferred for heroic deeds, and hence, an order of knighthood; also, the person bearing such title or rank.

(2):

(n.) A civil officer in some Swiss cantons.

(3):

(n.) A small banner.

(4):

(n.) Originally, a knight who led his vassals into the field under his own banner; - commonly used as a title of rank.