After the Jisho Juei Revolt, during which the Taira government collapsed, he was handed a Juei-ninen Jugatsu no Senji (a written decree from the Emperor and the Great Council of State) by Emperor Goshirakawa in 1183, which granted him sovereign authority (effective control of Tokaido and Tosando) over the eastern provinces.
しかし平家打倒の治承・寿永の乱を経て、寿永2年/治承7年（1183年）に後白河天皇から東国における統治権的支配権（東海道・東山道の実質的支配権）を認める寿永二年十月宣旨を与えられる。