The Saikitama Kofun Cluster (埼玉古墳群, Sakitama kofun-gun) is a group of burial mounds located in the city of Gyōda, Saitama Prefecture, in the Kantō region of Japan.
According to the Nihon Shoki chronicle, in 534 AD, Emperor Ankan appointed Nao Kasahara as Kuni no miyatsuko after he won a succession battle in Musashi Province for that post, and miraculously a keyhole-shaped tomb appeared in Kasahara, Saitama Country (present-day Konosu, Saitama) overnight, indicating the favor of the Yamato kingdom.
The existence of these tumuli were known in the Edo period and were commented upon in local histories, such as the "Shinpen Musashi Fudoki".
In 1893, the Shōgunyama Kofun [ja] was excavated and in 1935 a survey of the area indicated that 11 keyhole-shaped and 11 circular-type mounds existed.
The area was developed into the Sakitama Kofun Park (さきたま風土記の丘, Sakitama Fudoki no Oka), and in addition to the tumuli, a number of traditional minka farm houses were relocated to the historic park for preservation.