The history of Korean court dance can not be studied without knowledge of Korean court music history, because of their close interrelationship between the two areas in the historical development of court performing arts from the Koryo˘ period onwards. This is the reason shy the musicologist Chang Sa-hun 張師勛 (1916-1991) published a monograph on Korean court dance, Han`guk cho˘nt`ong muyong yo˘n`gu 『韓國傳統舞踊硏究』(Seoul: Iljisa, 1977), and why the present author has published several essays on Korean court dance of the Choso˘n period. The present study is actually an unexpected result in the course of studying the court music of the early Choso˘n period. This chapter consists of four subdivisions: 1) Introduction: Importance of Studying Court Dance History 2) New Court Dances Created before the Reign of King Sejong, 3) New Court Dances Created during the Reign of King Sejong, and 4) Conclusion: A new Understanding of Court Dance History of the Early Choso˘n Period. In conclusion, it is mentioned that the eight court dances created in the early fifteenth century were codified as court dances in Akhak kwebo˘m 『樂學軌範』(1493). Most of the created court dances were not transmitted, and only the two court dances, Cho˘ngdaeo˘p and Pot`aep`yo˘ng, have handed down to the present day as ritual dances (ilmu) in the royal ancestral shrine music in the National Center of Korean Traditional Performing Arts (國立國樂院).