Xiao Sagezhi (Chinese: 蕭撒葛只; died 8 October 951), posthumous name Empress Huaijie (懷節皇后), was an empress consort of the Khitan-led Liao dynasty of China. She was one of the two empresses of Emperor Shizong (Yelü Ruan) and was the mother of Emperor Jingzong (Yelü Xian).
It is not known when Xiao Sagezhi was born. Her father, whose personal name was Aguzhi (阿古只) and who was probably still using the surname Shulü (述律) at the time that she was born, was a younger brother of Empress Shulü Ping, the wife of Liao's founder Emperor Taizu.
During the time that Yelü Ruan was carrying the title of Prince of Yongkang under his uncle Emperor Taizong, he took Xiao Sagezhi as a consort.
During Emperor Shizong's reign
Emperor Taizong died on 15 May 947, and the Liao chieftains supported Yelü Ruan to succeed him (as Emperor Shizong). In 948, she gave birth to his second son, Yelü Xian, and later gave birth to three daughters, Yelü Hegudian (耶律和古典), Yelü Guanyin (耶律觀音), and Yelü Sala (耶律撒剌). In 950, for reasons unclear in history, Emperor Shizong created Xiao Sagezhi empress, even though he had already earlier created Lady Zhen (the mother of his third son, Yelü Zhimo (耶律只沒)), as empress.
In 951, Emperor Taizong's cousin Yelü Chage (耶律察割) mutinied and killed Emperor Shizong in a coup. Emperor Shizong's mother Empress Dowager Xiao and Empress Zhen were also killed. Empress Xiao, who had just recently given birth to Yelü Sala, rode a human-pulled cart to see Yelü Chage, asking to be allowed to prepare Emperor Shizong for burial. The next day, Yelü Chage also killed her. After Yelü Chage's coup was put down by Emperor Shizong's cousin (Emperor Taizong's son) Emperor Muzong, he gave Empress Xiao the posthumous name of Empress Xiaolie (孝烈皇后; "the filial and achieving empress"). After Yelü Xian became emperor in 969 (as Emperor Jingzong), he buried both Empresses Zhen and Xiao at Yiwulü Mountain, and built a temple dedicated to them. In 1052, Emperor Jingzong's grandson Emperor Xingzong changed her posthumous name to Empress Huaijie (懷節皇后; "the missed and careful empress").