What is Zuo Cheng's official position?

Zuocheng, namely Shangshu Zuocheng and Zhongshu Zuocheng. At the beginning of the northern song dynasty, he was a four-product guard officer, and there was no pre-existing funeral. After Zongshen Yuanfeng's political reform, he was promoted to the second place, occupying the position of power, being the deputy prime minister, ranking in six ministers and participating in major policies.

Zuo Lang is a kind of Langguan. Qin Jia. Along the Western Han Dynasty, it belonged to Guangluxun, with a rank of more than 600 stones, the same as the corps commander, and higher than the assistant minister and the corps commander. The negotiator is a consultant, so he doesn't have to be on duty in turn, and acts as a guard of the portal. In the Eastern Han Dynasty, general officials were under the jurisdiction of the five senses corps commander and the left and right corps commander, with Yi Lang as an exception. His rank has also been raised to 600 stone, and he has to participate in the affairs of the country.