a combination of Quảng Nam Quốc (the domain of the Nguyen lords, from whom the Nguyễn dynasty descended) and Đại Việt (which the first emperor of the Nguyễn dynasty, Gia Long, conquered). Qing emperor Jiaqing refused Gia Long's request to change his country's name to Nam Việt, and changed the name instead to Việt Nam. Đại Nam thực lục contains the diplomatic correspondence over the naming. Peter Bellwood suggested that ethnic Vietnamese are descended from the ancient Yuè of northern Vietnam and western Guangdong. However, the Austroasiatic predecessor of modern Vietnamese language has been proven to originate in modern-day Bolikhamsai Province and Khammouane Province in Laos as well as parts of Nghệ An Province and Quảng Bình Province in Vietnam, rather than in the region north of the Red River delta. Chamberlain demonstrates with textual evidence that many rebel groups during the Tang dynasty originated from the Cả River and subsequently pushed northward to the Red River, linking this to the linguistic shift. Chamberlain demonstrates, based on the concentration of linguistic diversity of the Vietic, the lack of any trace of Austroasiatic in relevant ancient records, or in the neighbouring Tai languages, as well as the short time depth of Proto-Vietic, that "[t]here is no evidence of Vietic, Proto-Việt-Mường or other Austroasiatic speakers living in and around Jiaozhi in the lower Red River basin prior to the 10th or 11th centuries." However, John Phan (2010), citing Maspero 1912, Wang 1948, & Miyake 2003, points out the existence of an "Early Sino-Vietnamese" layer of loanwords traceable back to Later Han Chinese (25 AD–220 AD), which he claims was spoken in the 2nd century BCE. Ferlus (2009) also demonstrates that Northern Vietic (Việt–Mường) and Central Vietic (Cuoi-Toum) invented from original verbs, rather than borrowed foreign words, lexical items corresponding to innovations like "trident", "oar", "pan to cook sticky rice", & "pestle", characteristic of the Dong Son culture, existing in the 1st millennium BCE in the Red River delta. Evidence gathered by modern Western scholarship indicates that the Dong Son culture were most likely ethnically Hlai people (a Tai people), Austronesians or both. Citing other scholars (Shafer 1970, Blust 1996, Sagart 2004, Sagart 2005, Ostapirat 2013, Kelley 2013, and Chamberlain), Joachim Schliesinger states that the theory that the Vietnamese language was originally based in the area of the Red River in what is now northern Vietnam has been widely rejected by modern Western