What is the "ancestor of iron emblem" in the history of calligraphy?

In the history of calligraphy in Song Dynasty, it is worth paying great attention to the publication and engraving of French calligraphy posts. Song Taizong inherited the prose of Song Taizu and Yan Wu, and also wanted to develop in literature and art, so he paid attention to engraving posts. In 992 (three years), Song Taizong of Song Chunhua published the ancient calligraphy collected by the Secret Pavilion, and Wang Zhu, a bachelor of letters, sorted it out, marked it with a calligraphy post, copied it on a jujube board, and presented it to the minister in ten volumes, and then it was no longer given. The backboard was destroyed by fire. The appearance of "Spring Pavilion Post" is largely attributed to ancient calligraphy. And lifelike, full of spirit, known as the crown of all kinds of legal posts. Later posts were greatly influenced by it. The title of the first volume used the name "Fa Tie", which was the first among calligraphy models, so it was called the originator of Fa Tie.

This post includes manuscripts of ancient emperors, famous ministers and various families, as well as manuscripts of Wang Xizhi and Wang Xianzhi. Among them, the calligraphy of Hexian and his son accounts for half of the whole post. The early official seal rubbings are treasured by the contemporary world, and the ministers who boarded the Chinese Book Province and the Privy Council only got one position, but today, less than a hundred years later, official seal rubbings are extremely difficult to find.

Apart from introducing the calligraphy of the two kings, Chunhua Pavilion Post also discusses the calligraphy of famous artists of You and Jin Dynasty. Since the publication of "Spring Flower Pavilion Post", it has created an atmosphere for the official and private engraving of posts in the Song Dynasty, which was more popular in the Southern Song Dynasty. There are two kinds of direct reprints of Chunhua Pavilion Post, such as Erwangfu Post in Southern Song Dynasty, Shaoxing imperial academy Post, Xichun Xiuneisi Post, Jia Sidao Edition, Quanzhou Edition, Sufu Edition, and Chunhua Pavilion Post reprinted in Qing Dynasty. Apart from directly reprinting according to Chunhua,