It appears fairly clear that Du Hui, not Du Guo/Gao (with "Guo" and "Gao" being two easily confused characters), was Du Ruhui's grandfather, but not completely. Du Ruhui's biography in the Old Book of Tang first said that Du Hui was his grandfather, and then said that Du Guo was his grandfather. See Old Book of Tang, vol. 66 "舊唐書 列傳 卷十一至二十". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. The New Book of Tang gave only Du Guo as his grandfather. See New Book of Tang, vol. 96 "唐書 列傳 第十一至二五". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. However, both works referred to the Book of Sui, mentioning that Du Guo's biography was in the Book of Sui -- which, in turn, did not actually have a biography for anyone named Du Guo or Du Gao. See Table of Contents for the Book of Sui. The History of Northern Dynasties, vol. 70 "北史 列傳 卷五一至六十". Archived from the original on 2008-02-06. Retrieved 2008-02-11., however, contained a biography of Du Gao, the contents of which were consistent with Du Ruhui's biography but did not mention Du Ruhui's father Du Zha as a son -- and made a stray reference to Du Gao's older brother as Du Changhui (杜長暉), which many later historians believed to be intended to be a lead-in to Du Ruhui's family tree. As "Changhui" could be a courtesy name for Du Hui (particularly since Du Gao's courtesy name was mentioned as Zihui (子暉)), those historians of this camp believed that the History of Northern Dynasties biography for Du Gao confirmed that Du Guo/Gao was Du Ruhui's granduncle, not grandfather. The Zizhi Tongjian, for example, referred to Du Ruhui as Du Guo's grandnephew. See Zizhi Tongjian, vol. 179. See also the correspondence between Liao Weiyu (廖位育) and Bo Yang in the appendix of the Bo Yang Edition of the Zizhi Tongjian, vol. 48. The biography of Du Ruhui's uncle Du Yan in the Old Book of Tang -- also in vol. 66 -- gave yet different names for the lineage, giving the names of Du Yan's grandfather as Du Ye (杜業) and father as Du Zheng (杜徵). It might be that Du Yan was not actually an uncle but only someone one generation higher in the Du clan. However, if this is true, the historical accounts gave no indication of such other than the discrepancies in the names of ancestors.
web.archive.org
It appears fairly clear that Du Hui, not Du Guo/Gao (with "Guo" and "Gao" being two easily confused characters), was Du Ruhui's grandfather, but not completely. Du Ruhui's biography in the Old Book of Tang first said that Du Hui was his grandfather, and then said that Du Guo was his grandfather. See Old Book of Tang, vol. 66 "舊唐書 列傳 卷十一至二十". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. The New Book of Tang gave only Du Guo as his grandfather. See New Book of Tang, vol. 96 "唐書 列傳 第十一至二五". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. However, both works referred to the Book of Sui, mentioning that Du Guo's biography was in the Book of Sui -- which, in turn, did not actually have a biography for anyone named Du Guo or Du Gao. See Table of Contents for the Book of Sui. The History of Northern Dynasties, vol. 70 "北史 列傳 卷五一至六十". Archived from the original on 2008-02-06. Retrieved 2008-02-11., however, contained a biography of Du Gao, the contents of which were consistent with Du Ruhui's biography but did not mention Du Ruhui's father Du Zha as a son -- and made a stray reference to Du Gao's older brother as Du Changhui (杜長暉), which many later historians believed to be intended to be a lead-in to Du Ruhui's family tree. As "Changhui" could be a courtesy name for Du Hui (particularly since Du Gao's courtesy name was mentioned as Zihui (子暉)), those historians of this camp believed that the History of Northern Dynasties biography for Du Gao confirmed that Du Guo/Gao was Du Ruhui's granduncle, not grandfather. The Zizhi Tongjian, for example, referred to Du Ruhui as Du Guo's grandnephew. See Zizhi Tongjian, vol. 179. See also the correspondence between Liao Weiyu (廖位育) and Bo Yang in the appendix of the Bo Yang Edition of the Zizhi Tongjian, vol. 48. The biography of Du Ruhui's uncle Du Yan in the Old Book of Tang -- also in vol. 66 -- gave yet different names for the lineage, giving the names of Du Yan's grandfather as Du Ye (杜業) and father as Du Zheng (杜徵). It might be that Du Yan was not actually an uncle but only someone one generation higher in the Du clan. However, if this is true, the historical accounts gave no indication of such other than the discrepancies in the names of ancestors.
wikipedia.org
zh.wikipedia.org
It appears fairly clear that Du Hui, not Du Guo/Gao (with "Guo" and "Gao" being two easily confused characters), was Du Ruhui's grandfather, but not completely. Du Ruhui's biography in the Old Book of Tang first said that Du Hui was his grandfather, and then said that Du Guo was his grandfather. See Old Book of Tang, vol. 66 "舊唐書 列傳 卷十一至二十". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. The New Book of Tang gave only Du Guo as his grandfather. See New Book of Tang, vol. 96 "唐書 列傳 第十一至二五". Archived from the original on 2008-02-10. Retrieved 2007-12-18.. However, both works referred to the Book of Sui, mentioning that Du Guo's biography was in the Book of Sui -- which, in turn, did not actually have a biography for anyone named Du Guo or Du Gao. See Table of Contents for the Book of Sui. The History of Northern Dynasties, vol. 70 "北史 列傳 卷五一至六十". Archived from the original on 2008-02-06. Retrieved 2008-02-11., however, contained a biography of Du Gao, the contents of which were consistent with Du Ruhui's biography but did not mention Du Ruhui's father Du Zha as a son -- and made a stray reference to Du Gao's older brother as Du Changhui (杜長暉), which many later historians believed to be intended to be a lead-in to Du Ruhui's family tree. As "Changhui" could be a courtesy name for Du Hui (particularly since Du Gao's courtesy name was mentioned as Zihui (子暉)), those historians of this camp believed that the History of Northern Dynasties biography for Du Gao confirmed that Du Guo/Gao was Du Ruhui's granduncle, not grandfather. The Zizhi Tongjian, for example, referred to Du Ruhui as Du Guo's grandnephew. See Zizhi Tongjian, vol. 179. See also the correspondence between Liao Weiyu (廖位育) and Bo Yang in the appendix of the Bo Yang Edition of the Zizhi Tongjian, vol. 48. The biography of Du Ruhui's uncle Du Yan in the Old Book of Tang -- also in vol. 66 -- gave yet different names for the lineage, giving the names of Du Yan's grandfather as Du Ye (杜業) and father as Du Zheng (杜徵). It might be that Du Yan was not actually an uncle but only someone one generation higher in the Du clan. However, if this is true, the historical accounts gave no indication of such other than the discrepancies in the names of ancestors.
