Emperor Ai of Tang
Li Zuo was born in 892, at the main palace at the Tang imperial capital Chang'an. His father Emperor Zhaozong was already emperor at that point, and he was Emperor Zhaozong's ninth son. His mother was Consort He, who had previously given birth to an older brother of his, Li Yu, Prince of De, who was Emperor Zhaozong's oldest son.
Yang Shihou
In 907, Zhu Quanzhong had Tang's last emperor, Emperor Ai, yield the throne to him, ending Tang and starting a new Later Liang as its Emperor Taizu. In 909, Emperor Taizu recalled Yang Shihou from Shannan East, commissioning him as the commander of the forces preparing to attack Lu Prefecture (潞州, in modern Changzhi, Shanxi), which was then ruled by Later Liang's archrival Jin (i.e., the state ruled by Li Keyong's son and successor Li Cunxu). He sent Wang Ban (王班) to Shannan East to serve as acting military governor in Yang's absence. (As Yang departed Xiang Prefecture, he warned Wang Ban that certain officers, including one Wang Qiu (王求), were unruly and might mutiny in his absence; Wang Ban took no precautions, however, and later in the year Wang Qiu assassinated Wang Ban and rebelled, but the rebellion was quickly put down.)