A jester, court jester, or fool, was historically an entertainer during the medieval and Renaissance eras who was a member of the household of a nobleman or a monarch employed to entertain him and his guests. A jester was also an itinerant performer who entertained common folk at fairs and markets. Jesters are also modern-day entertainers who resemble their historical counterparts. Jesters in medieval times are often thought to have worn brightly coloured clothes and eccentric hats in a motley pattern and their modern counterparts usually mimic this costume. In medieval times jesters entertained with a wide variety of skills: principal ones included songs, music, and storytelling; additional ones included acrobatics, juggling, telling jokes, and magic tricks. Much of the entertainment was performed in a comic style and many jesters made contemporary jokes in word or song about people or events well known to their audiences.
The modern use of the English word jester did not come into use until the mid-16th century during Tudor times. This modern term derives from the older form gestour, or jestour, originally from Anglo-Norman (French) meaning story-teller or minstrel. Other earlier terms included fol, disour, and bourder. These terms described entertainers who differed in their skills and performances but who all shared many similarities in their role as comedic performers for their audiences.
Scholar David Carlyon has cast doubt on the "daring political jester", calling historical tales "apocryphal", and concluding that "popular culture embraces a sentimental image of the clown; writers reproduce that sentimentality in the jester, and academics in the Trickster", but it "falters as analysis".
Jesters could also give bad news to the King that no one else would dare deliver. The best example of this is in 1340, when the French fleet was destroyed at the Battle of Sluys by the English. Phillippe VI's jester told him the English sailors "don't even have the guts to jump into the water like our brave French".