Because Zhao's royal family suffered a heavy blow, as his son, he naturally has the responsibility to shoulder the heavy responsibility of reviving the Song Dynasty, and his identity is also very legitimate. Because the north became very dangerous because of Xu Jin's invasion, the focus of the Southern Song Dynasty shifted to the south. However, Zhao's relatives always wanted to return to their native land in the north, and the ancestral grave was also in Henan, so the queen left a will before her death, asking her to simply preserve and bury it after her death (that is, simply bury it).
As we all know, there was a very famous general in the Southern Song Dynasty. He is Yue Fei. Yue Fei's bravery made the Zhao royal family see the hope of returning to the north, so the queen asked for burial, hoping to bring her coffin back together when she returned to the north. Later, from the empress, many Zhao royal families, including the kings of the Southern Song Dynasty, adopted the method of festival burial.
These are the reasons why the tomb of the Southern Song Dynasty is only two meters deep. This behavior represents their nostalgia for the Northern Song Dynasty. But what they didn't expect was that they couldn't recapture the old rivers and mountains in the Northern Song Dynasty until the Southern Song Dynasty fell. Because later, although Jin Guo disappeared, a stronger Mongolia appeared.