Yoriyasu had a strong armed group, called Kikyo ikki (uprising) from the Toki family and always made military contributions and supported for Takauji ASHIKAGA, the Seii Taishogun (literally, "great general who subdues the barbarians") during the Kanno Disturbance, so he was awarded Shugoshiki (post of provincial constable) of Owari Province in 1352.
頼康は「桔梗一揆」と呼ばれる土岐氏一族の強力な武士団を有しており、観応の擾乱では征夷大将軍足利尊氏を常に支持して武功があり、その功績によって観応2年（1352年）に尾張国守護職を与えられた。