Cai Lun
Later history books, such as the Song dynasty's ' (; "Compound Source of Matters and Facts"), also include Cai and his work in papermaking. However, some major history books, such as the ' (; "Annals of the Later Han") and "" (; "Comprehensive Mirror in Aid of Governance") do not mention Cai's papermaking achievements. Sinologist T H Barrett suggested this was because "Cai Lun was, after all, a palace eunuch, precisely the sort of person normally viewed with antagonism by the regular bureaucrats who controlled the writing of official (and even most unofficial) history."