Sentence examples for a knight from inspiring English sources

The phrase "a knight" is correct and usable in written English.
It can be used when referring to a person who is a member of a historical order of knighthood or in a metaphorical sense to describe someone exhibiting chivalrous qualities.
Example: "In the story, the hero was portrayed as a knight who bravely defended the kingdom from invaders."
Alternatives: "a noble warrior" or "a gallant hero".