We were lucky to fall in with Kote Koubanishvilli, perhaps the county's leading exponent of this form of satirical, political wordplay.

BBC: To be in Tbilisi

For this he has been taken to task by Terry Eagleton, a professor of English at Oxford University and a leading exponent of politically committed criticism.

ECONOMIST: Contemporary-art criticism

Warhol was a leading exponent of the pop art movement that flourished in the 1960s, with images of Marilyn Monroe, Elizabeth Taylor and Campbell's soup cans among his most famous works.

BBC: Andy Warhol portraits 'forgotten' for 30 years