Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
since in the same book he asserts that many speakers have revealed their urbanity in narrative. And a little later he gives the following definition, which is, as he says, based on the views expressed by Cato:
Urbanity is the characteristic of a man who has produced many good sayings and replies, and who, whether in conversation, in social or convivial gatherings, in public speeches, or under any other circumstances, will speak with humour and appropriateness. If any orator do this, he will undoubtedly succeed in making his audience laugh.
But if we accept these definitions, we shall have to allow the title of urbane to anything that is well said. It was natural therefore that the author of this definition should classify such sayings under three heads, serious, humorous and intermediate, since all good
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sayings may be thus classified. But, in my opinion, there are certain forms of humorous saying that may be regarded as not possessing sufficient urbanity.