Gion Otsukayama Kofun

...The mirror in the southern coffin is a triangular-rimmed mirror decorated with divine beasts, similar to the one in the Maruyama Kofun (Tsuruyama) in Okayama Prefecture, and the quivers are made of woven vegetable fabric painted with black lacquer and decorated with ornaments. They contained arrows with copper and iron arrowheads.
[Gion Otsukayama Tomb]
A keyhole-shaped tumulus from the late 5th century located in Gion, Kisarazu City, Chiba Prefecture. It was one of a group of ancient tumuli in the alluvial plain on the south bank of the Kobitsu River, but no longer exists.

*Some of the terminology used in reference to the Gion Otsukayama Kofun is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…南棺の鏡は岡山県丸山古墳(鶴山)に同笵鏡のある仿製の三角縁神獣鏡であり，靫は植物質の編物に黒漆を塗って作り装飾を加えたもので，銅鏃･鉄鏃を装着した矢を収めていた。
【祇園大塚山古墳】
　千葉県木更津市祇園にあった5世紀後半の前方後円墳。小櫃川南岸の沖積地にある古墳群中の一基で，現存しない。…

※「祇園大塚山古墳」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報