Which immortal is enshrined in Tianhou Palace?

In the Han area of China, because there is no real religion, or religion is very underdeveloped, it is actually polytheism and pantheism. Coupled with the vast territory and great regional differences, there have been many regional folk beliefs and many regional myths. These myths are often related to local history and can be regarded as a part of local history. For example, Mazu worship originated from Meizhou Island in Fujian and spread widely in Taiwan Province Province and southeast coastal areas. It is said that Mazu was the daughter of Lin Yuan, the magistrate of Putian County in the Northern Song Dynasty. He died to save the shipwreck, and was named Poseidon by the Emperor of Heaven to protect the peace at sea. There are also historical records that she was the daughter of an ordinary fisherman in Fujian at the end of the Tang Dynasty. Whether there was inspector Lin Yuan in the Song Dynasty, whether Lin Yuan had such a daughter, or whether she was just a fisherman's daughter, and whether she had original deeds, all these were impossible to find and meaningless. However, the god Mazu only appeared in Fujian after the end of the Tang Dynasty, but it had certain historical inevitability, indicating that the place was the most developed area for navigation at that time, so there was a god dedicated to protecting navigation safety. Without Mazu, it is entirely possible to create another god. At that time, men were all at sea, and women were waiting at home to bless them. Therefore, we must be a goddess, so that she can feel more cordial and reliable about men sailing on the sea. This is probably a common phenomenon in the world. I once saw dozens of nautical goddesses specially collected by Chilean writer Nie Luda in his former residence, which turned out to be sculptures placed on the bow, indicating that women were once regarded as the patron saint of navigation in the west. The expansion of the geographical scope of Mazu worship is the evidence that Fujian immigrants migrate to various places. For example, most of the people introduced to Taiwan Province are descendants of Fujian immigrants, and Mazu worship was introduced to Taiwan Province Province with Fujian immigrants. Another part of the bound immigrants moved to the mountainous areas of Zhejiang, and also built Mazu Tempel into their new settlement. However, because it is a mountainous area, it is no longer practical to bless navigation, so the Tianhou Palace dedicated to Mazu has actually become a place for migrant workers. In Shanghai and Tianjin, Mazu Tempel (Tianfei Palace and Tianhou Palace) appeared because of the migration of Fujian people. Since sailing is no longer the main occupation of Fujian immigrants there, Tianfei Palace and Taihou Palace are actually places where Fujian countrymen meet.