The Soga clan intermarried with the imperial family, and by 587 Soga no Umako, the Soga chieftain, was powerful enough to install his nephew as emperor and later to assassinate him and replace him with the Empress Suiko (r. 593–628). Suiko, the first of eight sovereign empresses, is sometimes considered a mere figurehead for Umako and Prince Regent Shōtoku Taishi (574–622). However she wielded power in her own right, and the role of Shōtoku Taishi is often exaggerated to the point of legend.