a wise man of Gotham

a wise man of Gotham

a foolish person. dated
Gotham is a village in Nottinghamshire which is associated with the folk story The Wise Men of Gotham, in which the inhabitants of the village demonstrate their cunning by feigning stupidity. Gotham is now a nickname for New York City, used originally by Washington Irvine but later linked particularly with the Batman stories.
See also: man, of, wise