The Yang Jian family came from six towns in the north during the Northern Wei Dynasty.The six towns assembled the main military force of the Northern Wei Dynasty to resist Rouran. As Emperor Xiaowen of Wei moved the capital to Luoyang, the military generals of the six towns were far away from the political core and their status began to decline.In the harsh natural and social environment, the soldiers in the six towns established a military group based on blood and geographical relationships...