《汉书·传·匡张孔马传》
北宫有紫房空中阁道与未央宫相通，傅太后果然从阁道早晚到皇帝的住处，请求皇上赐予尊号，让她的亲属富贵受宠，使得皇上不能根据正直的原则秉公行事。
北宫有紫房复道通未央宫，傅太后果从复道朝夕至帝所，求欲称尊号，贵宠其亲属，使上不得直道行。
There was a Zifang Aerial Corridor in the North Palace which connected to Weiyang Palace. Empress Dowager Fu indeed went to the emperor's residence through the corridor every morning and evening, asking the emperor to grant her an honorable title, and to let her relatives get rich and honored, which prevented the emperor from upholding justice according to upright principles.