李愬
Li Su was born in 773, during the reign of Emperor Daizong. His father was Li Sheng, who would later rise to prominence as a major general during the reign of Emperor Daizong's son Emperor Dezong. When Li Su was young, on account of his father's accomplishments, he was first made "Xielü Lang" (), a low-level official in charge of music at the ministry of worship (太常寺, "Taichang Si"), and later the deputy minister of army supplies (衛尉少卿, "Weiwei Shaoqing"). His birth mother died early, so he was raised by another concubine of Li Sheng's, Lady Wang, who was created the Lady of Jin. When Lady Wang died, Li Sheng, because she was not his wife, did not have Li Su observe the mourning rites for a mother, but Li Su tearfully requested to be allowed to observe those rituals, and Li Sheng agreed.