In the Senka era, the Soga clan became Oomi (great minister) and increased in power, in addition, the Soga clan retained the ministers position by for itself, and held the center of political power during the Emperor Sushun era (year of '587'to'592').
宣化朝に蘇我氏が大臣になり勢いを増し、崇峻天皇朝（587年-592年）では蘇我氏が大臣一人で政権の中枢を握った。