Who is the author of the world's second-line script "Sacrificing a Nephew"?

The Draft of Sacrificing a Nephew was written by Yan Zhenqing, a calligrapher in the Tang Dynasty.

"Sacrifice to a Nephew" (full name: Sacrifice to a Nephew and Praise to a Doctor) is a calligraphy work written by Yan Zhenqing, a calligrapher of the Tang Dynasty, in the first year of the Tang Dynasty (758). It is now in the National Palace Museum in Taipei.

Introduction:

The manuscript of "Sacrificing My Nephew" is Yan Jiming's manuscript, which is a memorial to his nephew. * * * 23 lines, 234 words. This manuscript tells the story of Yan Gaoqing and his son, the magistrate of Changshan, who stood up in the Anshi Rebellion and stood up to be loyal and opposed, so that "the father was trapped and the child died, and the nest was overturned" and justice was brought into his heart. Throughout the pen, I feel like a tide, the calligraphy is magnificent, and the vertical pen is bold and unconstrained.

Wang Xizhi's Sacrifice for a Nephew, Preface to Lanting and Su Shi's Cold Food Post in Huangzhou in the Northern Song Dynasty are both called "the three major running scripts in the world" and "the second running script in the world".

Moreover, this manuscript was written in extreme grief and indignation, regardless of the clumsiness of pen and ink, so the words fluctuate with the calligrapher's mood, which is purely a natural expression of spirit and peacetime work. This is rare in the whole history of calligraphy, so "Sacrifice to a Nephew" is one of the original works with great historical and artistic value.