jester:
(plural: ‘jesters‘)

a jester
(in former times) a man in brightly coloured funny-looking costumes who amuses others by doing silly things or telling jokes, kept at the royal court by a ruler during the Middle Ages;
{in the present usage} a man who is holding an important position but, because of his silly behaviour or unwise thinking, is considered funny and so not to be taken seriously,

Kris Katchit, a popular modern day jester
In the past, though a son of a mason became a mason, a prince became a king, a person became a jester not because he was the son of a jester but because he had the talent of making others laugh with his antics and foolishly wise jokes.
In the Medieval Ages, every royal court in Europe and some other parts of the world, retained jesters to entertain the guests at royal banquets on special occasions or just to ease the boredom of the royalty.
Now-a-days, though there are different names for an entertainer of a jester’s standing, the name ‘jester’ is used to refer to a celebrity or notable politician who does or says something silly, especially in response to news reporters’ questions on some delicate political affairs.
