Xiao Siwen (? — 970) was a Chinese politician who served as the chancellor and northern commissioner for military affairs of the Liao dynasty.[1] He was the father of Xiao sisters (Xiao Hunian, Lady Xiao and Xiao Yanyan). However, for the sake of the overall situation and family glory, he agrees to make his youngest daughter Xiao Yanyan married with Yelü Xian and in 969, after Yanyan become the Liao Empress, Xiao then honoured as King of Wei (魏王).[2] Later, when he an accompanied Xian Siwen on the hunt, he was assassinated by Gao Xun's people.[3][4]