苏代 / Su Dai
苏代 / Su Dai appears in 《资治通鉴·周纪》29丨苏秦励志爽文：知识改变命运 as one of 苏秦’s famous brothers. The episode uses him with 苏厉 to show that Su Qin’s career belongs not only to an individual rise narrative but also to a broader Warring States family of persuaders.
The source does not develop Su Dai’s independent diplomacy. His role here is connective: he widens Su Qin’s story from personal self-study into a family branch inside 纵横家外交.