《资治通鉴·唐纪·唐纪六十六》
甲子，唐懿宗任命兵部侍郎、充诸道铁转运等使、驸马都尉于琮为同平章事。
甲子，以兵部侍郎、充诸道盐铁转运等使、附马都尉于琮同平章事。
In the year of jiazi, Emperor Yizong of Tang appointed Yu Cong, Shangshu of the Ministry of War, Zhidu Iron Transportation Envoy for Various Routes and Fuma Duwei as Tongpingzhangshi.