《资治通鉴·唐纪·唐纪二十九》
唐玄宗命令后宫妃嫔以下的人在宫中养蚕，想借此让她们懂得一些妇女应做的事。
上命妃嫔以下宫中育蚕，欲使之知女功。
Emperor Xuanzong of Tang ordered the concubines in the harem and below to raise silkworms in the palace, hoping to use this to help them understand what women should do.