Empress Dowager Cixi 's co-regent , Empress Dowager Ci'an , died suddenly in 1881 .
Empress Dowager Cixi 's co-regent , Empress Dowager Ci'an , was rumoured to have been poisoned by Cixi .
Empress Dowager Cixi 's co-regent , Empress Dowager Ci'an , died suddenly in 1881 and was rumoured to have been poisoned by Cixi .