According to the "Gukansho," when Goshirakawa made a visit to Joken's Shishigatani mountain retreat, FUJIWARA no Narichika, Saiko and Shunkan met together to talk about plans to destroy the Taira clan and Yukitsuna was called and given 30 rolls of Uji fabric to make white flags for the launch.
『愚管抄』によれば、後白河が静賢の鹿ケ谷山荘に御幸した際、藤原成親・西光・俊寛が集まり平氏打倒の計画が話し合われ、行綱が呼ばれて旗揚げの白旗用として宇治布30反が与えられたという。