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。

158.Fukuchiyama Castle Part1

Mitsuhide Akechi spent 5 years to get Tanba Province back. What he did after the conquer of the province was to build Fukuchiyama Castle.

Location and History

Mysterious younger age of Mitsuhide Akechi

Fukuchiyama Castle was located in the northern part of Tanba Province which is modern day part of Kyoto Prefecture. Tanba Province is not popular for the present generation because the province was not large and finally merged to Kyoto and Hyogo Prefectures. However, it was very important in the past because of its location just behind north of Kyoto, the capital of Japan. Especially, in unquiet times like the Sengoku Period, it was a critical area for Kyoto. That’s why the shoguns and rulers of Kyoto always tried to have the province governed by them directly or by their senior vassals. Nobunaga Oda, the ruler during the 1570’s to the 1580’s, did the same way as others by sending his senior vassal, Mitsuhide Akechi, who built Fukuchiyama Castle.

The range of Tanba Province and the location of the castle

The Portrait of Mitsuhide Akechi, owned by Hontokuji Temple (licensed under Public Domain via Wikimedia Commons)

Mitsuhide is a mysterious person to many history fans. It is still uncertain where he came from though his family name, “Akechi” is said a member of the Toki Clan, one of the noble Minamoto families. One of the few certain things about his younger age was that he was a relative of Nohime, Nobunaga’s legal wife. He became a vassal of a prospective shogun, Yoshiaki Ashikaga, when they met in Ichijodani of Echizen Province. It was a turn of fate that Mitsuhide introduced Yoshiaki and Nobunaga to each other before they went to Kyoto in 1568 to become the Shogun and the Ruler. He was not only a well-connected person, but also an excellent politician and an intelligent general so he eventually joined Nobunaga, an avatar of the merit system.

The sttue of Nohime at Kiyosu Park in Kiyosu City
The statue of Nobunaga Oda at Kiyosu Park
The gate of the Ichijodani Asakura Clan Hall Ruins
The seated statue of Yoshiaki Ashikaga, owned by Tojiin Temple (licensed under Public Domain via Wikimedia Commons)

Mitsuhide builds Fukuchiyama Castle after Invasion of Tanba Province

Mitsuhide was ordered by Nobunaga to invade Tanba Province in 1575, which was divided by many local lords such as the Naito Clan in Yagi Castle, the Hatano Clan in Yagami Castle, and the Akai Clan in Kuroi Castle. Moreover, they had been against Nobunaga since he banished Yoshiaki from Kyoto in 1573. At first, everything was going good so far, where Hideharu Hatano became Mitsuhide’s supporter. However, when he began to siege Kuroi Castle, wherein a strong general, Naomasa Akai stayed, Hideharu switched side. Mitsuhide was defeated and had to withdraw. As a result, he spent 5 years to get the province back by building new castles like Kameyama Castle, hence making the Hatano Clan surrender again – waiting for Naomasa’s death and captured Kuroi Castle in the end. What Mitsuhide did after the conquer of Tanba Province was to build Fukuchiyama Castle in 1579.

The portrait of Hideharu Hatano, from the database of Historiographical Institute, the University of Tokyo (licensed under Public Domain via Wikimedia Commons)
Yagami Castle Ruins seen from Sasayama Castle Ruins
The illustration of Naomasa, from the signboard at Kuroi Castle Ruins
Kuroi Castle Ruins

The castle was originally called Yokoyama Castle, which a local Lord built and was located on the edge of the hill in the Fukuchiyama Basin where the Lord was able to overlook the area around. It was also surrounded by rivers, which meant it was defensive. Mitsuhide renovated the castle by introducing current advanced techniques of castle construction like high stone walls and building the Main Tower to show Nobunaga’s authority. Other than that, Mitsuhide governed the area well for the people’s lives by providing tax exemptions and building banks beside the rivers to avoid flood. People in Fukuchiyama City still remember them. Mitsuhide placed his son-in-law -Hidemitsu- at the castle while he stayed in the Kameyama Castle near Kyoto.

The miniature model of Fukuchiyama Castle, exhibited by the current Main Tower of the castle
The restored Main Tower of Fukuchiyama Castle
The old photo of the Main Tower of Kamayama Castle (licensed under Public Domain via Wikimedia Commons)

Castle becomes Homebase of Fukuchiyama Domain after Honnoji Incident

The most mysterious thing about Mitsuhide is why he killed Nobunaga who is staying in Kyoto in the Honnoji Incident on the 2nd of June by the lunar calendar of 1582. Mitsuhide with about 13 thousand soldiers, which was ordered by Nobunaga to help Hideyoshi Hashiba, another senior vassal, who invaded the Chugoku Region, made a surprise attack on Nobunaga who was staying in Honnoji Temple with few attendants. That meant Nobunaga had fully relied on Mitsuhide. Mitsuhide was also beaten by Hideyoshi who made an incredible quick return from the Chugoku Region, only 11 days after the incident. No colleagues helped Mitsuhide. That also meant his action had not been planned. It is one of the biggest mysteries in Japanese history, seeking the reason for his rebellion as he did without giving any reasons.

The picture of the Honnoji Incident, attributed to Nobukazu Yousai, in 1896 (licensed under Public Domain via Wikimedia Commons)
~The Portrait of Hideyoshi Toyotomi, attributed to Mitsunobu Kano, owned by Kodaiji Temple (licensed under Public Domain via Wikimedia Commons)

Fukuchiyama Castle was ruled by several relatives of Hideyoshi who became the next ruler and changed his family name to Toyotomi. After the Tokugawa Shogunate got the power in the 17th Century, several family-lineage feudal lords such as the Arima and Kuchiki Clans governed the castle and the area around as the Fukuchiyama Domain. This meant that the Fukuchiyama area was still important for the Rulers and Shoguns. The Arima Clan completed the castle in the beginning of the 17th Century and the Kuchiki Clan owned the castle from the late 17th Century to the end of the Edo Period.

The illustration of Fukuchiyama Castle in Tanba Province, exhibited by the National Archives of Japan

To be continued in “Fukushiyama Castle Part2”