The "Emperor's Preface to the Holy Tripitaka" is a preface written by Tang Emperor Taizong (r. 626-649) to praise Master Xuan Zang's translation works on the sutras he brought back from India. It also includes a postscript written by Taizong's son, Emperor Gaozong. Since the Tang, the preface has been engraved on four different steles. All were inscribed in the writing of Tang calligraphers, except for this one. It was the works of the famous Jin dynasty calligrapher Wang Xizhi (321-379) that appeared on this stele. Emperor Taizong deeply admired Wang's works and felt the important text of the Preface must be dignified by Wang's script. He ordered Dharma Master Huairen, who was also an accomplished calligrapher, to collect the 1,904 characters for the Preface's inscription from Wang's various works preserved in the imperial court. It took Huairen 25 years (648-672) to compile all the characters into one seamless piece. The resulting inscription has been regarded as a significant reservoir of Wang's calligraphy, preserving and passing on the works of the master calligrapher, in addition to being an excellent resource to learning to write in Wang's style. Since the inscription assembles Emperor Taizong's preface, Emperor Gaozong's postscript, and the calligraphy of Wang Xizhi in one stele, it is also honorably titled the Triply Unique Stele.