《北史·列传·卷三十》
《祭祀志》上说 ：建武二年正月，开始在洛阳城南七里设郊坛祭祀。参照西汉孝平帝元始年间的旧例，北郊坛设在洛阳城北四里的地方。 
《祭祀志》云： 建武二年正月，初制郊兆于雒阳城南七里，依采元始中故事，北郊在雒阳城北四里。 
The “Jisi Zhi” says: in the first month of the second year of the Jianwu era, people began to make sacrifices at the Suburban Altar that had been erected seven li to the south of the Luoyang city. With reference to the old example established by the Emperor Xiaoping during the Yuan Shi years of the Western Han Dynasty, the Northern Suburb Altar was built at a place four li to the north of the Luoyang city.