As chronicled in the Nihon Shoki , he was accused of treason .
As chronicled in the Nihon Shoki , he was strangled himself at Yamada - dera in 649 ; his wife and seven of his children also committed suicide ; other relatives were captured and executed .
As chronicled in the Nihon Shoki , he was accused of treason and strangled himself at Yamada - dera in 649 ; his wife and seven of his children also committed suicide ; other relatives were captured and executed .