After Umako had died, his son SOGA no Emishi became a minister and led the imperial court; at the same time, Marise enlarged his political power as a member of a powerful family originated from the same Soga clan as Emishi; therefore, gradually he came into serious antagonism with Emishi not only in the Soga clan but also in the imperial court.
馬子の死後は、子の蘇我蝦夷が大臣を継いで朝政を主導するが、摩理勢も蘇我氏族内の有力一門として発言力を保ち、蘇我氏内部においても朝廷政治においても蝦夷の対抗勢力となり、次第に対立を深めていく。