《旧唐书·本纪·卷十七》
该监设于元和十四年，养马三千二百匹，毁耕地四百余顷，因此撤毁了是好事。
此监元和十四年置，马三千二百匹，废百姓田四百余顷，停之为便。
The prefecture was established in the 14th year of Yuanhe, and 3200 horses were raised there, destroying more than 400 hectares of arable land. Therefore, it was a good thing to destroy it.