Why did Wu Zetian name the founding of the People's Republic Zhou?

Why is Wu Zetian so interested in the word "Zhou"? Legend has it that shortly after the beacon tower played the title of vassal, it was killed by the invading dog Rong The capital Haojiang was also destroyed. Zhou Youwang's son fled hastily, became king in Nanyang, Henan Province, and soon moved to Luoyang, known as the Eastern Zhou Dynasty. Yijiu was the first emperor of the Eastern Zhou Dynasty-Zhou Pingwang. After the birth of our youngest son, his handwriting is in the shape of "Wu", and his descendants take "Wu" as their surname. Wu Zetian, who is extremely clever, knows that she openly proclaimed herself emperor, and will inevitably be opposed by many people. Being born in poverty and having a low family background is the first goal of the opponents. The social atmosphere at that time was very particular about this. There are two well-known Tang poems: Xie Tang, the old king, flew into the homes of ordinary people. Among them, "Xie Wang" refers to Wang Jia and Xie Jia in the Jin and Southern and Northern Dynasties. These two surnames belonged to the two most famous surnames at that time, and seven of the ten princes came from these two surnames. In the Sui and Tang Dynasties, aristocratic families were repeatedly hit, but the concept of surname hierarchy has been deeply rooted in the hearts of the people. Wu Zetian knew this well, so she did it again. Grasping the myth that the youngest son can't be verified, he is the 40th generation descendant of the Zhou family. At the same time, his youngest son was honored as Emperor Rui Zukang, and his father's military commander was honored as Emperor Gao. In this way, Wu Zetian became a descendant of the Zhou family, and it seems natural for her to be an emperor. This is the secret that she is kindly called "Zhou".