158.Fukuchiyama Castle Part2

The southwestern side of the stone wall base of the Main Tower is covered with many diverted stones and some of them are used for its corners. Why did Mitsuhide use them for the important part of the tower?

Features

Main Enclosure as Fukuchiyama Castle Park

Today, the current Fukuchiyama Castle remains as a historical park. The original castle includes the Main, Second and Third Enclosures in a line on a hill. However, the park has only the Main enclosure at the edge of the hill because the Second Enclosure’s part was cut down and turned into residential areas. Therefore, the Fukuchiyama Castle park looks like a castle on a small mountain, which stands out in the city.

The map around the castle

The park has been well developed for visitors so that they can easily walk up on the paved slopes to the top of the hill. You will climb the slope along the remaining stone walls and the restored stone one’s of the Main Enclosure where you can see a diverted stone being used as fillings for the gaps on the wall.

Fukuchiyama Castle Park
The paved path on the slope
The diverted stone that fills the gap

You can access the Main Enclosure by entering the restored Tsurigane-mon or the Hanging Bell Gate after climbing the stone steps or by going on the slope. There is a large well called Toyoiwa-no-i, which is 50m deep and still has 37m deep water.

The slope on the left and the stone steps to the Hanging Bell Gate on the right
The restored Hanging Bell Gate
The Toyoiwa-no-i Well

Main Tower Base uses lots of Diverted Stones

The restored Main Tower is on the original stone wall base which has a complex shape in a plane view because the original tower was extended several times. The entrance of the tower is at the eastern side which has a newer part of the original base.

The aerial photo around the Main Enclosure, there are lots of deverted stones at the lower left of the red lines

The restored Main Tower of Fukuchiyama Castle
The entrance at the eastern side of the Main Tower

If you walk around the base to the southern side, you will find the base uses a lot of diverted stones. Diverted stones refer to the stones which had originally been processed and used for other purposes, such as tombstones, stone statues, and stone mills, but were collected and used for rapid castle constructions. Other examples of using them can be seen in castles like Yamato-Koriyama, Matsusaka and Himeji Castles.

The southern side a lot of diverted stones
A diverted stone used in Yamato-Koriyama Castle (little above the middle)
A diverted stone used in Matsusaka Castle

You may be surprised to see that the southwestern side of the stone wall base is covered with more diverted stones. The view of the restored Main Tower is good, but you should also check out how the stones are used. The stone wall base was mainly piled using natural stones in a method called Nozura-zumi. The diverted stones in other sides are used to fill gaps between these natural stones. However, the diverted stones at the southwestern side are used to form the corners of the base, the most important part of it. Basically, the corners of stone wall bases must support most of the weight of the tower, even in a case of emergency, such as an earthquake.

A view of the Main Tower of Fukuchiyama Castle from the southwest
So many diverted stones
The diverted stones used in a corner

What is Mitsuhide’s intention?

For example, in 2016 many earthquakes happened in Kumamoto, the Iidamaru-five-level Turret of Kumamoto Castle was once supported by only one corner stone even though other stones around had collapsed. Around the southern part of the Fukuchiyama Castle’s Main Tower was said to be the oldest, so Mitsuhide Akechi probably built it. Why did he use so many diverted stones and installed them into the important part of the tower?

Iidamaru-five-level-turret and the miracle lone stone walls in July,2016, quoted from the Sankei Photo

One possible reason is purely technical. The diverted stones in the corner are cuboid ones which look like tombs or carved Buddha status. Collecting them might have been useful for Mitsuhide to build the castle efficiently and rapidly. On the other hand, a local tradition says that Mitsuhide’s troops destroyed the temples which were against his orders and took the tomb stones away from them to build the castle. If it is true, using the stones might have meant the new lord showing the conquest and the authority to people. Other historian argued that it must have symbolized the contribution of people to the castle’s construction or taking Buddha’s power in the castle. Overall, only Mitsuhide can answer this question.

Why did Mitsuhide use these diverted stones for the important part of the tower?

So far, about 500 diverted stones were found in the stone walls of the castle or excavated in other places. The excavated ones lie down in vacant spaces in the Main Enclosure.

The diverted stones lying down in the Main Enclosure

To be continued in “Fukuchiyama Castle Part3”
Back to “Fukuchiyama Castle Part1”

158.福知山城 その2

天守台石垣の南西の辺りは多くの転用石に覆われていて、天守台の隅石としても使われています。なぜ光秀はこんなにも多くの転用石を使い、しかも天守の重要な部分にはめ込んだのでしょうか。

特徴、見どころ

福知山城公園となっている本丸

現在の福知山城は、歴史公園として残っています。もとあった城は、丘陵の上に本丸、二の丸、三の丸が一直線に並んでいました。しかし公園は、丘陵の端にある本丸だけとなっています。その理由は、二の丸だった部分が削り取られて市街地となっているからです。よって、福知山城公園は小山の上にある城のように見えて、市街地の中でとても目立っています。

城周辺の地図

小山の上にある城のように見えます

公園はビジター向けによく整備されていて、丘の上の方には舗装された坂道を登って簡単に行くことができます。本丸の現存する石垣と復元された石垣に沿って登っていきますが、そこでは石垣の隙間を埋めるために、転用石が使われているのを見ることができます。

福知山城公園
坂を登る舗装路
石垣を埋めている転用石

本丸へは、そのまま坂を登って行くことも、石段を登って復元された釣鐘門経由でも行くことができます。本丸には、「豊磐井(とよいわのい)」と呼ばれる井戸があり、深さが約50m、水位も今でも37mあります。

左側が坂道の続き、右側が釣鐘門への石段
復元された釣鐘門
豊磐井

多くの転用石が使われている天守台

復元された天守は、オリジナルの天守台石垣の上にありますす。天守は元あったものが何度も拡張されて、平面上複雑な形をしています。天守の入口は東側にあって、その辺りは天守台の中では新しい部分となります。

本丸周辺の航空写真、赤線の左下が転用石が多い部分

福知山城の復元天守
東側の天守入口

天守台の南側を回っていくと、天守台には多くの転用石が使われているのに気付かれるでしょう。転用石とは、もともとは別の目的(墓石、石仏、石臼など)のために加工され使われていたものが、城を急いで建設するために集められ、再利用される石のことをいいます。他の城で転用石が使われいる事例としては、大和郡山城松坂城姫路城などが挙げられます。

天守の南側から転用石が目立ってきます
大和郡山城の転用石(真ん中上方)
松坂城の転用石

天守台石垣の南西の辺りは更に多くの転用石に覆われていて、少々驚かれるかもしれません。この方角からの天守の眺めはとても良いです。しかし、転用石がどのように使われているかも注目してみて下さい。この天守台石垣は主に自然石を使った野面積みという方式によって積み上げられています。他の面での転用石は、自然石の隙間を埋めるために使われていますが、南西面の転用石は天守台の隅石としても使われています。基本的に天守台の隅石は、天守のほとんどの重量を支えています。。

南西から見た福知山城の復元天守
夥しい転用石
隅石に使われている転用石

光秀の意図はなにか?

地震のような非常事態の場合には尚更です。例えば、2016年に熊本地震が発生したときには、熊本城の飯田丸五階櫓は一時、周りの石垣が崩れてしまっても、一角の石垣(一本石垣)によってのみ支えられる状態になっていました。この南側周辺が、福知山城天守の中ではもっとも古い部分と言われています。恐らく光秀が築いた部分なのでしょう。なぜ光秀はこんなにも多くの転用石を使い、しかも天守の重要な部分にはめ込んだのでしょうか

飯田丸五階櫓と一本石垣、2016年7月時点、産経フォトより引用

ありうる理由の一つは純粋に技術的なものです。隅石として使われている転用石は直方体で、元は墓石か仏石であったように見えます。こういった石を集めて使うことは、光秀が城を効率的に早く築くためには大変役に立ったと思われます。一方、地元の言い伝えによれば、光秀の軍勢は光秀の命令に従わない寺を破壊し、そこから墓石を持ち出して城の建設に使ったということです。これが事実であれば、このような石を使うことは、新しい領主がその地を征服したことと権威を人々に見せつけることになるでしょう。歴史家の中には、これは城の建設に人々が協力していたことを象徴しているとか、仏の力を城に取り込もうとしたのだと言う人もいます。結局のところ、その答えを知っているのは光秀のみでしょう。

これらの石を重要な部分に使った意図は何でしょうか

これまでのところ、約500個の転用石が石垣の中か、他の場所での発掘により見つかっています。本丸の空き地には、発掘で見つかった転用石が並べられています。

本丸に並べられている転用石

「福知山城その3」に続きます。
「福知山城その1」に戻ります。

14.Mito Castle Part3

After seeing the restored Main Gate and Corner Turret, I would like the city to restore the Three-level Turret as the Main Tower of the castle as well.

Features

Only Remaining building in Castle

Back to the central street, you can go further to the Main Enclosure. You may be surprised to see, in front of the enclosure, another but much deeper (22m) dry moat. It is now used as a ground for the Suigun Railway Line. Of course, it is the castle’s original. The enclosure has the only remaining building of the castle, Yakui-mon Gate which was said the Satake Clan had built. If it’s true, the gate might have been used as their Main Gate. Please make sure you don’t enter the school to stay where you are allowed to see it on the designated area around after crossing the Honjo-bashi Bridge over the moat.

The map around the castle, the broken red line shows the Sugiyama Slope and the broken blue line shows the Sakumachi Route

The large dry moat in front of the Main Enclosure
Its bottom has become a ground for the Suigun Railway Line
Going to the Main Enclosure over the bridge
The Yakui-mon Gate, the only remaining building of Mito Castle

Other Attractions in Second and Third Enclosures

There are two original back routes from the Second Enclosure, which we can still use, the Sugiyama-zaka Slope in the north and the Sakumachi Route in the south. Both routes have restored gates called Sugiyama-mon and Sakumachi-Sakashita-mon. If you walk down on the southern route to go back to Mito Station, you will see the large scale plateau on your right side, which is covered by concrete panels today. There was also the large Senba Lake on the left in the past, but it was reclaimed and reduced to the original western part around the Kairakuen Garden.

The restored Sugiyama-mon Gate
The restored Sakumachi-Sakashita-mon Gate
The southern side of the huge plateau

If you have time, you should consider visiting the large outer dry moat of the Third Enclosure, at the root of the plateau. It remains as it was and only the earthen walls go across the moat to the prefectural office which was the senior vassals’ residences. Overall, the castle was protected by the three huge moats.

The aerial photo of around the castle

The large outer dry moat of the Third Enclosure
The earthen bridge has become the entrance of the prefectural office

Later History

Even after the severe events in the early Meinji Era, the Three-level Turret in the Second Enclosure of Mito Castle, which was so great that it was once called “One of the 20 remaining main towers in Japan”, had still remained until World War II, but it was burned down by the Mito air raids in 1945. After World War II, the Kodokan area was designated as a Special National Historic Site in 1952. The other items, the earthen walls, dry moats, and Yakui-mon Gate has been designated as historic sites of Ibaraki Prefecture. Mito City has recently restored some castle buildings as we can see now.

The remaining earthen walls around the Yakui-mon Gate at the Main Enclosure
A inside view of the Main Gate

My Impression

After visiting the ruins of Mito Castle, I realized that strong castles don’t always need stone walls. This was proven not only by the past battles, but also by the two dry moats being used for the current transportation. In addition, seeing the restored Main Gate and Corner Turret, I would like the city to restore the Three-level Turret as the Main Tower of the castle as well. This is because the 8 Main Towers, which had been burned down mostly during World War II, were restored except for that of Mito Castle. However, there is no plan for it yet.

A view of the earthen walls and the dry moat in front of the Second Enclosure from the Main Bridge
The explanation board of the Three-level Turret is at a different place from its original position

How to get There

If you want to visit there by car, it is about a 15 minutes drive away from Minami-Mito IC on the Kitakando Expressway or a 30 minutes drive away from Mito IC on the Joban Expressway. There is a parking lot beside the Main Gate.
By public transportation, it takes about 10 minutes on foot to get there from JR Mito Station.
From Tokyo to Mito Station: Take the Hitachi limited express at Tokyo Station.

The parking lot beside the Main Gate

That’s all. Thank you.
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