An Lushan
In 755, An Lushan rebelled against Emperor Xuanzong's reign at Fanyang (范陽, in modern Beijing), and quickly advanced south, capturing the Tang eastern capital Luoyang later in the year. In spring 756, he declared himself emperor of new state of Yan. Historical records, however, did not explicitly state that she was created empress at that time. (In response to An's rebellion, Emperor Xuanzong executed his first wife Lady Kang and oldest son An Qingzong (安慶宗), both of whom were then at the Tang capital Chang'an.) Lady Kang's son An Qingxu was the second oldest son, but was not favored by An Lushan. Instead, An Lushan favored both Lady Duan and her son An Qing'en, and was considering creating An Qing'en crown prince. By spring 757, An Lushan was severely ill and blind. He was also ill-tempered, and his attendants, as well as An Qingxu, all feared death. An Qingxu therefore entered into a conspiracy with the high-level official Yan Zhuang (嚴莊) and An Lushan's eunuch Li Zhu'er (李豬兒), and they assassinated An Lushan. An Qingxu succeeded to the Yan throne. No further reference was made to Empress Duan after that point.