Why were ancient epitaphs buried underground?

Epitaph is an important material to record the life story of the deceased. The epitaph was written to spread the story of the deceased, but in ancient times, the epitaph was buried underground. To explain this problem, we have to start with the shape of the epitaph. Epitaph refers to the stone carving engraved with the deeds of the deceased in the tomb, which is divided into two parts: annals and inscriptions. Xu Shi, a writer in Ming Dynasty, once wrote a preface to Stylistic Discrimination. Epitaph "said:" As far as its topic is concerned, there is an epitaph and an inscription. "The record is prose, which records the surname, nationality and life of the deceased; Inscriptions are often written in verse, mostly praising the deeds of the dead, with mourning words. The ancients attached great importance to epitaphs, so after the death of the tomb owner, his family often tried their best to invite famous people to write the epitaphs of the deceased. And some scholars are also famous for being good at writing epitaphs. For example, Zhang Shuo, a scholar in the Tang Dynasty, was good at writing epitaphs, and people were proud to ask him to write epitaphs. The ancients attached great importance to death, and they regarded death as another stage of life continuation. Not only the funeral of the ancients should be very grand, but also there are many kinds of exquisite, even the epitaph of the deceased should be carefully set to prevent the hell from knowing the identity of the deceased. As early as the Han Dynasty, people have recorded some town tombs. 1975, a bamboo slip was unearthed from the tomb of Fenghuang Mountain 168 in Jiangling, Hubei Province, indicating the identity of the deceased, and I hope the hell will take care of it. The epitaph buried deep underground also means to inform the underground government of the identity of the deceased. The ancients paid attention to morality and made a statement. People who write epitaphs often write the life of the deceased as an epitaph, which is equivalent to naming the deceased. With the help of these precious materials, we can understand the life of the tomb owner and the information that is not in the history books. Han Yu's Epitaph of Liu Zihou is a classic epitaph, and this article is written for a generation of literary giant Liu Zongyuan. In the epitaph, Han Yu greatly praised Liu Zongyuan's literary talent and expressed his grief over his bumpy life experience.