 The Sima clan was initially subordinate to the Wei dynasty, but through various intrigues and other means the Sima family and their supporters had continued to gain power at the expense of the Cao family and their supporters.In February 266, Sima Yan (later Emperor Wu) forced emperor Cao Huan of Wei to abdicate the throne to him, ending Wei and starting the Jin Dynasty (as Emperor Wu).Political it was a perilous time, especially for Wei loyalists, who viewed the rise of the Sima clan as usurpers.