The "extermination of nine kindreds" (誅九族) is considered one of the most severe punishments found in traditional Chinese law enforced until the end of Qing. The practice of exterminating the kins had been established since Qin when Emperor Qin Shi Huang (reigned 247 BC–221 BC) declared "Those who criticize the present with that of the past, "Zu"" (以古非今者族). "Zu" (族) referred to the "extermination of three kindreds" (三族): father, son and grandson. The extermination was to ensure the elimination of challenges to the throne and political enemies. Emperor Wen of Sui (reigned 581–604) abolished the practice but it was reintroduced by the succeeding Emperor Yang (reigned 604–617). Not only did he bring back the punishment, but he also extended it to the nine kindreds.