According to "Go Dan Sho," written by Oe no Masafusa, there is an example of the above: Yorimichi did not give away Tsubo kiri no ken (a traditional sword handed down from emperor to crown prince) which passed through successive princes for 23 years until the enthronement of the prince, the reason being that 'the Tsubo kiri no ken was meant for the FUJIWARA clan's (specially the Sekkan-ke (families of the Fujiwara clan whose members were eligible to become regent) treasure.'
その一例として、歴代の東宮が伝領する「壷切の剣」を頼通が「藤原氏（特に摂関家）腹の東宮の宝物」との理由で、23年もの間、親王が即位するまで献上しなかった事が、大江匡房の談話集『江談抄』に記されている。