A stone monument with a Freemasonry mark engraved on the ruins of Sendai Castle Ote Gate

A Freemason stone monument near the site of the Sendai Castle Otemon Gate? Investigating the Sendai mystery! [Miyagi Prefecture]

In Sendai City, Miyagi Prefecture , there is Sendai Castle (Aoba Castle) the Freemasons , and it has become a bit of an urban legend.

Why is there a stone monument engraved with the symbol of the Freemasons, a secret society founded in the late 16th century or early 17th century, at Sendai Castle (Aoba Castle)? This time, we will explore the mystery


What kind of organization is the secret society "Freemasonry"?

Freemasonry is often described as a secret society with endless conspiracy theories due to the many mysterious aspects of it, but it is originally a fraternal organization that teaches and teaches basic human morality. It is thought to have been founded in Scotland or England in the late 16th or early 17th century, and is now said to have a diverse membership of around 6 million worldwide.

In English, individual members are called Freemasons or Masons, and when referring to the organization it is called Freemasonry, or simply Masonry

The specific activities of the Freemasons are kept secret and shrouded in mystery, but according to the official website of the Grand Lodge of Japan, they are involved in charity activities such as setting up schools and providing financial support to charitable organizations.The children's festival held in May (Masonic Children's Festival) and the barbecue held in August are open to the general public, even if they are not members.

Link: The Grand Lodge of Japan

It is an organization that aims to "realize the ideal of brotherhood among all mankind" and "realize the truest and highest ideals of civilization," and it is said that the founders of long-established organizations such as the Rotary Club and the Lions Club were also members of the Freemasons. In other words, it is believed that historically, various organizations have branched out from the Freemasons

Sendai Castle Ruins (Aoba Castle Ruins)
Sendai Castle Ruins (Aoba Castle Ruins)

For some reason, there is a stone monument that appears to have the symbol of the mysterious secret society, the Freemasons, engraved on it at the site of Sendai Castle (Aoba Castle)


"Upward-pointing triangle right angle ruler and compass" engraved on a stone monument near the site of the Otemon Gate

From the center of Sendai city, go straight on Aoba-dori. After crossing the Ohashi Bridge, you will come to a three-way intersection near the Sendai City Museum on your left. If you go straight at the intersection, you will reach Sendai Castle's Otemon Gate Tower, and if you turn right, you will head towards the Miyagi Museum of Art

Sendai Castle Otemon Waki-yagura
Sendai Castle (Aoba Castle) Otemon Gate Tower

The stone monument is located in the green area in the center of this three-way intersection

A Freemason stone monument in a green area between roads
A Freemason stone monument in a green area between roads

This is a wide-angle image. It's a little hard to see, but the building you see in the background of the photo is the location listed on Google Maps as "Sendai Castle Otemon Waki ​​Yagura."

A Freemason stone monument in a green area between roads (enlarged)
A Freemason stone monument in a green area between roads (enlarged)

Upon closer inspection, it is clear that there is an unusual mark engraved on the remains that does not seem to belong to Sendai Castle (Aoba Castle). An upward-pointing triangular right-angle ruler and compass can be seen, with the letter "G" in the center. It closely resembles the commonly symbol of Freemasonry

The upward-pointing right-angled ruler is said to symbolize "morality," while the compass symbolizes "truth," and in the middle of the ruler and compass is a large G. The G symbol is also said to contain the meanings of God, geometry, glory, tolerance, gold, and gnosis


The qualification for joining the Freemasons is to have some kind of faith

As for the qualifications for joining the Freemasons, anyone can join regardless of religion, including Judaism, Christianity, Islam, and Buddhism, but atheists are not allowed to join

Of the 6 million members worldwide, 150,000 are under the jurisdiction of the Grand Lodge of Scotland and the Grand Lodge of Ireland, 250,000 are under the jurisdiction of the Grand Lodge of the Commonwealth, 2 million belong to the Grand Lodge of the United States, and the Grand Lodge of Japan has approximately 1,500 members, of which approximately 250 are Japanese .


Why is it located at the Sendai Castle ruins? Does it hold the key to the history of the Sendai Castle ruins (Aoba Castle ruins)?

Why is there such a Freemason stone monument at the site of Sendai Castle (Aoba Castle)? The mystery can actually be solved by going back in history

Sendai Castle (Aoba Castle) has a history of being occupied by occupying forces after the war, and it is said that at that time the US military's "Sendai Lodge of Freemasons" was located there, and there is a strong theory that the stone monument in question is the "cornerstone of the Sendai Lodge of Freemasons."

After the San Francisco Peace Treaty, the remains of the main and second baileys of Sendai Castle (Aoba Castle) are now the site of Tohoku University, and Gokoku Shrine has been rebuilt on the site of the main bailey

Could it be said that the mysterious Freemason stone monument is reminiscent of the post-war era when the US military was still present?

Date Masamune, the first lord of the Sendai domain, was a member of the Freemasons , but this seems unlikely.

It is said that 2 million Freemasons belong to the Grand Lodge of the United States, so there must have been a US military "Sendai Lodge" there when the US military was stationed there

It's amazing how the history of Sendai Castle Ruins (Aoba Castle Ruins) can be unraveled from a place like this


Freemason Stone <Information>

  • Name: Freemason Stone at the Site of Sendai Castle (Aoba Castle)
  • Address: Aobayama, Aoba Ward, Sendai City, Miyagi Prefecture, 980-0856

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