In 783, when a mutiny by soldiers from Jingyuan Circuit (涇原, headquartered in Pingliang, Gansu) forced Emperor Dezong to abandon Chang'an and flee to Fengtian (奉天, in modern Xianyang, Shaanxi), Li Song accompanied Emperor Dezong to Fengtian, and was said to have personally protected Emperor Dezong during the journey to Fengtian, along with his younger brother Li Yi (李誼) the Prince of Pu.
He must have been born, however, in or before 805, as in 805, the same year when Emperor Xianzong's grandfather Emperor Dezong died and was succeeded by Emperor Xianzong's father Emperor Shunzong, he was created the Prince of Wen'an.
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