Engishiki, a book of laws and regulations compiled in the early Heian period, contains a list of mausoleums managed under the jurisdiction of Shoryoryo, which shows that the graves of maternal relatives of the imperial family (such as the members of the Fujiwara clan, which married daughters to emperors) were included among these mausoleums.
平安時代前期に編纂された延喜式には、諸陵寮管理下の陵墓の一覧表が記載されているが、このころの墓には外戚（皇妃の実家：藤原氏など）の墓も含まれている。