《旧唐书·列传·卷四十四》
延载初年，历任凤阁舍人、检校凤阁侍郎、代理宰相。延圣元年，犯错外调任集州刺史，不久又授天官侍郎。圣历初年，迁任凤阁侍郎，代理宰相。
延载初，历迁凤阁舍人、检校凤阁侍郎、同凤阁鸾台平章事，寻加正授，证圣元年，坐事，出为集州刺史，俄召拜天官侍郎。
In the early years of the Yan Zhai reign, Su held various positions including junior administrator of the Phoenix Pavilion, probationary minister of the Phoenix Pavilion, and acting prime minister. In the first year of the Yansheng reign, he was removed from his post due to an error and was appointed governor of Jizhou. Shortly afterward, he was bestowed with the title "assistant minister of astronomy." In the early years of the Shengli reign, he was transferred to the post of minister of the Phoenix Pavilion and acting prime minister.