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?
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They don't use 方言 in writing. In the old days, Chinese speaking and writing are two systems, they don't write what they say. They use another grammar and words in writing(文言). That makes all Chinese, no matter where you are from, can communicate without troubles.They can even communicate with Japanese, Koreans via 汉字(笔谈).
Ok, the question itself have made some mistake so I will correct it slightly.
方言 refers to a variation of Chinese that is SPOKEN in a certain (local) group.
It does NOT refer to the style or variation of the writing.
李白and 杜甫 are poets during the Tang dynasty.
The format of the poem itself was standardized way before that with the uses of 平仄(a form of notation for pronouciation).
The choice of words(style of writing) in the poem, is the style of 文言韻文(which is also standardize before them). The "predecessor" of today's 書面語.
So, no, the two person did not promote 方言 in their poems and they did not standardize writings.