Doulu's biography in the Old Book of Tang indicated that he died "more than 79 years old," but his biography in the New Book of Tang indicated that he died at age 79. Compare Old Book of Tang, vol. 90 "舊唐書 列傳 卷三一至四十". Archived from the original on 2007-10-11. Retrieved 2007-09-20. with New Book of Tang, vol. 114."唐書 列傳 第二六至四十". Archived from the original on 2007-10-11. Retrieved 2007-10-11.
Doulu Qinwang's biography in the Old Book of Tang indicated that Doulu Kuan was a nephew of Emperor Wen, but Doulu Qinwang's biography in the New Book of Tang indicated that Doulu Kuan was a grandson of Emperor Wen, implied that Doulu Tong married a daughter, not a sister, of Emperor Wen. Doulu Tong's biography in the Book of Sui indicated that he married Emperor Wen's sister Princess Changle. See Book of Sui, vol. 39."隋書 列傳 卷一至十". Archived from the original on 2008-01-23. Retrieved 2008-02-11.
Doulu's biography in the Old Book of Tang indicated that he died "more than 79 years old," but his biography in the New Book of Tang indicated that he died at age 79. Compare Old Book of Tang, vol. 90 "舊唐書 列傳 卷三一至四十". Archived from the original on 2007-10-11. Retrieved 2007-09-20. with New Book of Tang, vol. 114."唐書 列傳 第二六至四十". Archived from the original on 2007-10-11. Retrieved 2007-10-11.
Doulu Qinwang's biography in the Old Book of Tang indicated that Doulu Kuan was a nephew of Emperor Wen, but Doulu Qinwang's biography in the New Book of Tang indicated that Doulu Kuan was a grandson of Emperor Wen, implied that Doulu Tong married a daughter, not a sister, of Emperor Wen. Doulu Tong's biography in the Book of Sui indicated that he married Emperor Wen's sister Princess Changle. See Book of Sui, vol. 39."隋書 列傳 卷一至十". Archived from the original on 2008-01-23. Retrieved 2008-02-11.
