See, e.g., New Book of Tang, vol. 121 [biographies of Liu Youqiu and Zhong Shaojing].
It is unclear whether Yao Yí and Yao Yì were the sons who were said to have tried to improperly influence Wei Zhigu, as Yao Chong had six sons who were known to have been officials. See New Book of Tang, vol. 74, part 2."漢川草廬-二十四史-新唐書-卷七十四‧表第十四". Archived from the original on 2009-04-17. Retrieved 2009-03-13.[1]
web.archive.org
It is unclear whether Yao Yí and Yao Yì were the sons who were said to have tried to improperly influence Wei Zhigu, as Yao Chong had six sons who were known to have been officials. See New Book of Tang, vol. 74, part 2."漢川草廬-二十四史-新唐書-卷七十四‧表第十四". Archived from the original on 2009-04-17. Retrieved 2009-03-13.[1]