Answer: Kushans
Notes: According to Chinese sources, the Kushanas were also called Guishuang. The Kushanas were one of five branches of the Yuezhi tribe that lived in Central Asia or along the Chinese border. The Kushanas eventually became more powerful than the other Yuezhi tribes. In the 1st century CE, Kujula Kadphises brought the five tribes together and founded the Kushan Empire. The Kushanas moved east towards India, defeating the Parthians and the Sakas. The Kushanas were also known as Tocharians.
