Young Reddish Blonde Girl Outside With A Knight's Helmet And A Horse

Etymology
The word knight, from Old English cniht ("boy" or "servant"), is a cognate of the German word Knecht ("servant, bondsman"). This meaning, of unknown origin, is common among West Germanic languages (cf: Old Frisian kniucht, Dutch knecht, Danish knægt, Swedish knekt, Middle High German kneht, all meaning "boy, youth, lad", as well as German Knecht "servant, bondsman, vassal"). Old English cniht had no particular connection to horsemanship, referring to any servant. A rādcniht (meaning "riding-servant") was a servant delivering messages or patrolling coastlines on horseback. Old English cnihthād ("knighthood") had the meaning of adolescence (i.e. the period between childhood and manhood) by 1300.
A narrowing of the generic meaning "servant" to "military follower of a king or other superior" is visible by 1100. The specific military sense of a knight being a mounted warrior in the heavy cavalry emerges only in the Hundred Years' War. The verb "to knight", i.e. to make someone a knight appears around 1300, and from the same time, the word "knighthood" shifted from "adolescence" to "rank or dignity of a knight".