Octagonal Kofun

Octagonal Kofun (八角墳, hakkaku-fun) are a very rare kind of kofun.

Kengoshizuka Kofun [en] a notable Octagonal Kofun, where Empress Kōgyoku is buried^[1][2]

Many Japanese Emperors were buried in them including Empress Kōgyoku in Kengoshizuka Kofun [en],^[1][2] Emperor Tenji in his Mausoleum [ja],^[3] and Emperor Jomei in Dannozuka Kofun [ja]^[4]

From the end of the 6th century to the beginning of the 7th, the tumuli of the monarchs changed from square hōfun tumuli to octagonal hakkaku-fun tumuli.^[5]

List of Octagonal Kofun

• Ise Kofun (Fujioka City) [ja]
• Inari Kofun [ja]
• Oichi No.1 Kofun [ja]
• Kajiyama Kofun [en]
• Kengoshizuka Kofun [en]
• Gobyo Kofun [ja]
• Takei temple ruins [en]
• Dannozuka Kofun [ja]
• Tsukamyojin Kofun [ja]
• Nakaoyama Kofun [en]
• Nakayamasōen Kofun [en]
• King Noguchi Kofun [ja]
• Mitsuya Kofun [ja]
• Yoshida Kofun [en]