Tadachika was given important posts by Goshirakawa-in (the Retired Emperor Goshirakawa) and MINAMOTO no Yoritomo, and the diary's existent period stretches from the Taira clan's rise, through its golden days, to its fall.
忠親は後白河院や源頼朝に重用され、日記の現存期間は平氏の興隆から全盛、滅亡の時期にあたる。