What does "sikong" mean in "commonplace"?

The idiom "commonplace" comes from Liu Yuxi's poem "Gifting Li Sikong Prostitutes". It is common to see idle things, and cut off the Jiangnan thorn history intestine. The word "Sikong" used in the poem is the name of an official position in the Tang Dynasty, equivalent to the Shangshu of the Qing Dynasty. He was later transformed into an ombudsman, equivalent to the current prosecutor general of the public prosecutor's office.

　　Commonplace, Chinese idiom, pinyin: sī kōng jiàn guàn, refers to something common, not surprising. Sikong is an ancient official position that has appeared since the Western Zhou Dynasty. The Book of the Later Han Dynasty and the Hundred Officials' Chronicles say that all countries that have great construction and activities are under the control of the general public. Sikong's duties changed several times, and by the Tang Dynasty it had become a noble title. Equivalent to the current Prosecutor General of the Public Prosecutor's Office.

　　Common word usage: subject-predicate; predicate, definite, object; describe common things. This is a very common idiom, and if it is a natural event, it should not be quoted. If the sun rises and sets in the east, it cannot be said to be "commonplace". If it is an accident, and it is often heard. For example, in the street vehicles, it is usually very safe. One day there was an accident, such a thing, we have seen more, then it is more appropriate to use the four words "commonplace".

　　Commonplace allusions

　　During the Tang Dynasty, Liu Yuxi was a man who excelled in poetry and writing. After he won the Jinshi, he served as an inspector in the capital. Because of his bohemian personality, he was ostracized in Beijing and was relegated to the title of Suzhou Assassin. During his tenure in Suzhou, there was a local man named Li Sheng, who admired Liu Yuxi's fame and invited him to drink and invited several singers and prostitutes to accompany him at the table.

　　During the banquet, Liu Yuxi's poetry was full of poetry, so he composed a poem: "The new makeup of the high-haired cloud sideburns, the spring breeze and the song of Du Weiniang, the commonplace and idle things, and the Suzhou thorny intestines are cut off." Judging from Liu Yuxi's poems, the meaning of the whole idiom refers to the fact that Li Sikong has become accustomed to such things. Later, he used "commonplace" to describe things that are often seen and not surprising.