 In 244-45, Guanqiu Jian launched the Goguryeo–Wei Wars against Goguryeo from Xuantu Commandery (modern-day Shenyang).The Wei court instituted offices in You Prefecture to manage relations with the Wuhuan and Xianbei.To help sustain the troops garrisoned in Youzhou, the governor in AD 250 built the Lilingyan, an irrigation system that greatly improved agricultural output in the plains around Ji.