Liao Dynasty ( 907 -1125 ) The Great Wall of Liao Dynasty was largely built during the reign of Emperor Shengzong (972 – 1031) and Xingzong (1016 – 1055) for consolidation of the regime and the territorial expansion. It is also called Liao Bianhao with a trench dug in front of the single wall, extending 735 kilometers (457 miles) from today's Inner Mongolia in China to Mongolia via Russia. https://www.sutori.com/en/story/great-wall-history-map--gENJNrFmTggEFHVrNko5nGsX