Preface to Lanting, also known as Preface to Lanting Collection, Preface to Lanting Banquet, Preface to Linhe, Preface to Zan and Zan Tie. Written by Wang Xizhi, a calligrapher in Jin Dynasty. His calligraphy is of great artistic value, and it is also called the three major calligraphy posts with Yan Zhenqing's "Ji Ming Manuscript for the Sacrifice of a Nephew" and Su Shi's "Cold Food Post".