What is Jiang Wei?

A warrior durring the Three Kingdoms. He joins Shu-Han after Zhuge Liang forces Wei's lord to belive that there was a he was defecting to the Shu-Han forces. Zhugr Liang grooms Jiang Wei into his seccsor, and after Zhuge Liang's death, Wei begins seven more northen campangs and one last rebelion be for his death and the fall of the Shu-Han.