Ba-Shu Chinese
Ba-Shu Chinese (; Sichuanese Pinyin: Ba¹su²yu³; ), or Old Sichuanese (or Old Szechwanese; ), is an extinct Sinitic language formerly spoken in what is now Sichuan and Chongqing, China. This language is first attested in "Fangyan" during the Western Han dynasty (206 BCE–8 CE) and represents one of the earliest splits from Old Chinese or Early Middle Chinese. It became extinct during the end of South Song Dynasty due to the local people defenced the Mongolian get to conquer Sichuan Basin, of which the result was a failure and a massacre throughout the Sichuan Basin. When it was supplanted  by Southwestern Mandarin after settlement by people from other parts of China, mostly from present-day Hubei and Hunan, both are near the Sichuan. Phonological aspects of Ba-Shu Chinese are preserved in the Minjiang dialect of Sichuanese Mandarin and there is debate on whether it is a variant of Southwestern Mandarin or a modern day descendant of Ba-Shu. Phonology. Song dynasty. Though the Ba-shu language is extinct, some phonology features of rhymes are able to be found by researching the local literaries and poets' use of rhymes in their works. Liu Xiaonan assumed that they write verses  in Standard Chinese of Song dysnasty , but because their mother tongues was Ba-shu language, they unconsciously wrote with a Ba-shu accent of the time, which reflected in the rhymes. codas merger. According to Liu's research, there is enough evidence to assume a significant number of codas mergers had taken place or were taking place in Ba-shu language during the Song dynasty. Vocabulary. Ba-shu language had some unique words probably identified as substrate from Old Shu language by scholars.