128m keyhole mound in Nagaokakyo City — the centerpiece of the Otokuni Kofun Group. National Historic Site; restored as Igenoyama Kofun Park in 2014. Famous for the discovery of 700+ iron weapons from the front section. About 15 min walk from Hankyu Nagaokaten-jin Station. Also known for the tradition that Akechi Mitsuhide set up his headquarters here during the Battle of Yamazaki (1582), drawing interest from history fans.
Finds & research
700+ iron weapons including swords and arrowheads from the front section (Kyoto Prefectural Tangible Cultural Properties); cylindrical and figurative haniwa fragments.
Two views on the occupant
Archaeological view
128m keyhole mound (rear circle 78.6m, 10.4m high; front section 78.6m wide, 10.4m high; 30m moat). Early 5th century. The 1980 excavation of the front section yielded over 700 iron weapons (swords, arrowheads) — a nationally significant discovery. Haniwa rows and stone paving confirmed. Chieftain tomb of the Otokuni region. Tradition holds that Akechi Mitsuhide established his headquarters here during the Battle of Yamazaki (1582).
Imperial Household Agency view
Not designated by the IHA. Designated as a National Historic Site in 1981. Artifacts designated as Kyoto Prefectural Tangible Cultural Properties in 1999. Restored as "Igenoyama Kofun Park" in 2014.
Field notes
Open free as Igenoyama Kofun Park. About 15 min walk from Hankyu Nagaokaten-jin Station. Popular combined with Itsukahara (id:287), Moto-Inari (id:289), and Terado Otsuka (id:290) on an Otokuni Kofun tour.