[1] This Chinese custom was adopted by the Koreans, such as the party in 927, hosted by King Gyeongae of Silla, in Poseokjeong, Gyeongju.
Participants must compose a tanka poem beside a stream, within a time limit set by the passage of a lacquer cup of sake floating towards them on the water.
[2] When the cup reached the poet, they were expected to drink its contents, either as a celebration of the poem's completion or as a forfeit if they had not composed a suitable verse in time.
[3][4] The first kyokusui-no-en events were reportedly held in the Kofun period during the reign of Emperor Kenzō, making the ceremony around 1,500 years old.
[2] The modern Japanese version of the ceremony was created in 1963; participants dress in Heian era costumes of the nobility and musical accompaniment is provided on the koto.