In 624, Umako demanded Empress Suiko to give him Katsuragi no Agata, which was the military base of the Soga clan and a territory of the imperial family; however, Empress Suiko refused his demand, telling him that although she had yielded to all demands of Umako because she was a descendant of the Soga clan and Umako was her uncle, she would not be able to meet this particular demand.
推古天皇32年（624年）馬子は元は蘇我氏の本居で天皇家の領地となっていた葛城県の割譲を推古天皇に要求したが、推古天皇に「自分は蘇我氏の出で、大臣は伯父だから大臣の要求は何でも聞いたが、これだけは聞き入れられない」と拒否された。