In 607BC, Duke Ling of Jin (620-607) was killed by Zhao Chuan (趙穿) under the orders of his uncle Zhao Dun. Prince Heitun was placed on the throne as Duke Cheng of Jin (606-600). This was the beginning of the slow shift of power from the Jin dukes to the ministerial clans. Duke Li of Jin (580-573), the grandson of Duke Cheng, tried to break the power of the clans by fostering conflicts between them. In 573BC, he was killed by the Luan (欒氏) and Zhonghang (中行氏) clans. Duke Dao of Jin (572-558) strengthened the ducal power, but could not eliminate the power of the other aristocratic families.