fool or court jester, a person who entertains with buffoonery and an often caustic wit. In all countries from ancient times and extending into the 18th cent., mental and physical deformity provided amusement. Attached to noble and royal courts were dwarfs, cripples, idiots, albinos, and freaks. The medieval court fool was seldom mentally deficient. For the freedom to indulge in satire, tricks, and repartee, many men of keen insight and caustic wit obtained powerful patronage by assuming the role of fool. This role was played in the courts of the East, in ancient Greece and Rome, and in the court of Montezuma. The clown or jester was common in Elizabethan drama (e.g., the Fool in King Lear), and by donning the fool's garb the actor gained the freedom of the fool. His costume, which was hung with bells, usually consisted of a varicolored coat, tight breeches with legs of different colors—occasionally a long petticoat was worn—and a bauble (mock scepter) and a cap which fitted close to the head or fell over the shoulders in the form of asses' ears. Till Eulenspiegel and Robin Goodfellow are mythical fools.

or jester

Comic entertainer whose madness or imbecility, real or pretended, made him a source of amusement and gave him license to abuse and poke fun at even his most exalted patrons. Professional fools flourished in diverse societies from ancient Egyptian times until the 18th century. Often deformed, dwarfed, or crippled, fools were kept for luck as well as amusement, in the belief that deformity can avert the evil eye and that abusive raillery can transfer ill luck from the abused to the abuser. In some societies, they were regarded as inspired with poetic and prophetic powers. The greatest literary characterization of the fool is found in William Shakespeare's King Lear.

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