Su Qin
Su Qin (380–284 BCE), was an influential political strategist during the Warring States period of ancient China. He was born in Chengxuan Village, Luoyang in present-day Henan Province. According to legend Su Qin was a disciple of Guiguzi, the founder of the School of Diplomacy. He was the chief advocate of the Vertical Alliance system, which sought to create an alliance of the other states against the state of Qin. The opposing theory, "Horizontal Alliance" () supported alliances with the State of Qin.