https://en.wikipedia.org/wiki/Qin
Dynasties and states. Qin (state) (秦), a major state during the Zhou Dynasty of ancient China Qin dynasty (秦), founded by the Qin state in 221 BC and ended in 206 BC; Daqin (大秦), ancient Chinese name for the Roman Empire; Former Qin (前秦), Di state/Di (Wu Hu) in the Sixteen Kingdoms period, 351 AD; Later Qin (后秦), Qiang state in the Sixteen Kingdoms period, 384 AD