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Lady Dugu (personal name unknown), the fourth daughter of Dugu Xin was the posthumous empress of the Tang dynasty after her son, Li Yuan ascended the throne. It was not clear that when she was born but her brith year was believed to define between 536 AD and 544 AD where her elder sister, Empress Dugu (Northern Zhou) and the younger sister, Dugu Qieluo were born. She was possibly born from one of Dugu Xin's concubines.