[1] His father Liu Dan, also a prince, was stripped of his royal title for conspiring against the Han Emperor Zhao and the State of Guangyang was demoted to a prefecture.

[4] During the reign of Han Emperor Xuan, the family's royal status was restored and Liu Jian became prince.

[4] His descendants continued to rule as princes of Guangyang until Wang Mang overthrew the Western Han dynasty.

[4] Liu Jian's tomb was discovered in 1974 by workers of the East is Red Petrochemical Refinery who were digging inside two mounds of earth in Dabaotai village to bury storage tanks.

Inscription on a piece of lacquerware found inside the tomb indicates that the ware was made in the 24th year of the reign of the owner.

[5] According to historical records, only four princes in the Han dynasty ruled the Beijing region for as long as 24 years.

[1] During the excavation, archaeologists also found Jin-era artifacts including a brick well between the two tombs and remnants of a residence.

[6] Based on these facts, archaeologists believe the Jin residence and well may have been part of Consort Li's country retreat.

[6] The Jin-era artifacts were also incorporated into the mausoleum, which opened on December 1, 1983 and was designated a major historical landmark of Beijing in 1995.

Various records from antiquity have documented the cypress wall as a feature of royal Han tombs and those of nobles who were bestowed with the honor.

[4] The imperial tombs of the Western Han emperors had all been looted and destroyed in antiquity, so archaeologists had not seen such a wall until the Dabaotai excavation.

An iron axe found inside the tomb was stamped with the character 渔 for Yuyang, the name of the county near Guangyang where the item was made.

[5] Though the tomb was looted, some 400 pieces of bronze, jade, agate, silk, lacquer, and pottery artifacts have been recovered along with household wares.

[4] Scattered throughout the outer parts of the tomb are terra cotta clay figurines of maid servants.

[7] A Jin dynasty courtyard home stood in the vicinity of the two tombs and yielded over 1,000 artifacts including porcelain, pottery, ironware and coins.

Public bus stops nearby include Beijing World Park (世界公园公交总站) (477, 692), Dabaotai Subway Station (地铁大葆台站) (840, 959, 967) and Baotai Lu (葆台路站)(480, 969).