For several years from 1345, the government experienced a duarchy by Takauji and Tadayoshi; however, their relationship had broken down from the Kanno Incident; when Tadayoshi beat Takauji in 1951, Takauji retired from the front lines of politics once and Tadayoshi chose Yoshiakira, the son of Takauji, as his partner and started the new duarchy.
1345年から数年間は尊氏・直義の二頭政治が行われたが、観応の擾乱で両者の関係が崩壊し、観応2年に直義が尊氏に勝利すると、尊氏は一旦政治の第一線から退き、直義は尊氏の子・義詮をパートナーに選び、新たな二頭政治を開始した。