こんにちは！
Hello!
考古調査士の まえかた あとまる です。
I'm Maekata Atomaru, an archaeological researcher.
私のブログでは、全国の古墳や遺跡を見聞録風に紹介するよ！
In my blog, I'll introduce you to ancient tombs (KOFUN) and archaeological
sites all over Japan in the style of a travelogue!
記念すべき第1回は？？
What's the memorable first installment?
なんと東京のど真ん中！
In the middle of Tokyo!
東京タワーの目の前にある芝丸山古墳だよ！
It's the Shibamaruyama KOFUN, right in front of Tokyo Tower!
あれれ？？
What is it?
あんまりよく形がわからないけど上から見れば「鍵穴型」つまり前方後円墳！
I can't quite make out the shape, but if you look at it from above, it's a keyhole-shaped tomb!
長さはなんと106メートル
It's 106 meters long!
横から見ると右向きにおなかのへこんだ熊さんが寝てる感じ！
If you look at it from the side, it looks like a bear lying on its right side with its belly caved in!
造られたのは5世紀/AC400年代というから、当時の日本は倭の国！
It was built in the AC400~, so at that time, Japan was the country of WA!
5人の倭国の王が世代ごとに中国王朝に朝貢していたころ！
five kings of Japan were paying tribute to the Chinese dynasty each generation!
倭の5王とは「讚」（さん）「珍」（ちん）「済」（せい）「興」（こう）「武」（ぶ）
The five kings of Japan were San, Chin, Sei, Koh, and Bu.
日本書紀では応神・仁徳・履中・反正・允恭・安康・雄略天皇のいずれからしい！
In the Nihon Shoki,(A history of Japan compiled in Japan 1300 years ago.) it seems to refer to one of the following emperors: Ojin, Nintoku, Richu, Hanzei, Ingyo, Ankou,and Yuryaku!
ほぼ確実なのは「武」（ヤマタケル大王)＝雄略天皇！
Almost certain is that "Bu" （yamatakeru)= Emperor Yuryaku!
埼玉県と熊本県の古墳からでてきた鉄剣が証明したんだ！
Iron swords found in burial mounds in Saitama and Kumamoto prefectures proved it!
それはいいとして！
But enough of that!
古墳の上に上るとこんな感じ！
This is what it looks like when you go up to the top of the tomb!
江戸時代にだいぶ削られちゃったせいで
It was cut down a lot during the Edo period.
起伏がよくわからないけど奥が方形で手前が円形ね！
I can't really see the ups and downs, but it's square in the back and circular in the front!
サラリーマンのお兄さんと比較するとでかいのがわかると思おう！
If you compare it to your businessman brother, you'll see how big it is!
左下にあるのがパワーストーン？
Is that a power stone in the lower left corner?
いかにもって感じだけど！
It looks like it!
もしかしたら古墳の当時の石室の一部の石かもしれない！
Maybe it's a stone that was part of the original stone chamber of the tomb!
南武蔵有数の族長のお墓らしいからね！
It's said to be the tomb of one of the greatest chiefs of Southern Musashi!
東京タワーに来たついでに足伸ばしてみて！
While you're at the Tokyo Tower, why don't you take a look around?
東京でおそらく一番でかい古墳だから！
It's probably the biggest tomb in Tokyo!
引用／現地説明看板及びウィキペディア（Wikipedia）
Reference: Local explanatory signs and Wikipedia (Japanese only)