It is said Gosaga left his will asking the Kamakura bakufu (Japanese feudal government headed by a Shogun) to appoint the successor to rule the cloistered government, after the government asked Omiyain about who Gosaga's intended to succeed she named Emperor Kameyama, thus it was decided that Emperor Kameyama was to rule the direct government.
後嵯峨は治天下の指名を幕府に求める遺勅を残していたとされ、幕府は後嵯峨の内意を問い、大宮院の内意が亀山であったとする証言から亀山親政と定まる。