On March 3, 353 (in the lunar calendar), the Kyokusui no Utage (a poetry-making party at the stream in a garden) was held at the Rantei and a draft of a preface for a collection of poems created at that time was the Ranteijo.
353年（永和(東晋)9年）3月3日(旧暦)、蘭亭に会して曲水の宴が開かれ、その時に作られた詩集の序文の草稿が蘭亭序である。