A stone monument engraved with the Freemason mark near the site of the main gate of Sendai Castle

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

In Sendai City, Miyagi Prefecture, "Sendai Castle (Aoba Castle),", there isthe "Freemasons," whichhas become a topic of discussion as a minor 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"?

Freemasonryremains a mystery, it is often whispered about as a secret society constantly embroiled in conspiracy theories. However, it is actually considered a fraternal organization that teaches and shares fundamental human morality. It is believed to have been founded in Scotland or England in the late 16th or early 17th century, and today it is said to have around 6 million members worldwide.

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

While the specific activities of the Freemasons remain largely secret and shrouded in mystery, according to the official website of the Grand Lodge of Japan, they engage in charitable activities such as establishing schools and providing financial support to charity organizations. Surprisingly, thechildren's festival held in May (Masonic Children's Festival) and the barbecue held in August are open to the general public, not just 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 wider shot. It's a little hard to see, but the building visible in the background of the photo"Sendai Castle Otemon Wakiyagura" (Sendai Castle Main Gate Side Turret)is the location listed on Google Maps as

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, a distinctly unusual mark is visible, clearly not resembling any remnants of Sendai Castle (Aoba Castle). Itdepicts an upward-pointing triangle, a right-angle ruler and compass, and the letter "G" in the center.commonlythe Freemason symbolknown as

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, and 250,000 are under the jurisdiction of the Grand Lodges of the Commonwealth. Additionally, 2 million belong to the Grand Lodges of the United States, andthe number of members under the Grand Lodge of Japan is approximately 1,500, with about 250 being 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 the Allied occupation forces after the war, and it"Freemason Sendai Lodge"is said that there was athe "foundation stone of the Freemason Sendai Lodge.

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?

that Date Masamune, the first lord of the Sendai domain, was a member of the Freemasons, but that possibility 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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