With the establishment of the Quwo line, Jin became the most powerful state for three generations and remained powerful for a century or more after that. Duke Wu died soon after gaining control of Jin. He was followed by Duke Xian of Jin (676-651BC). Xian broke with Zhou feudalism by killing or exiling his cousins and ruling with appointees of various social backgrounds. He annexed 16 or 17 small states in Shanxi, dominated 38 others, and absorbed a number of Rong tribes. Some of the states conquered were Geng (耿), Huo (霍), old Wei (魏), Yu (虞) and Western Guo. His death led to a succession struggle which ended with the enthronement of Duke Hui of Jin (650-637). In 646BC, Duke Hui was captured by Qin and restored as a vassal.