Did 李白 and 杜甫 popularize/standardize any 方言? Two of the most well known Chinese poets ABC says:


  poet, second in fame only to Li Bai


of Du Fu.

Did either 杜甫 or 李白 popularize or standardize any sort of 方言 through their works? (Certainly not on purpose.)

Or were they very 书面 anyway?
李白and杜甫 make the language of Shaanxi(陕西）popular.
They were the people of tang dynasty ,and capital of the tang dynasty is Chang'an where is in Xi'an of Shaanxi province now.So the language of Shaanxi is standard for everyone like the dialect of Beijing has effect on Chinese now.