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

A Freemasonry stone monument near the ruins of Sendai Castle Otemon? Examining Sendai mystery! [Miyagi Prefecture]

is home to Date Masamune's castle , Sendai Castle (Aoba Castle) a "Freemason" and is a hot topic as a small urban legend.

Why is there a stone monument in Sendai Castle (Aoba Castle) engraved with the symbol mark of the secret society "Freemasons," which was established in the late 16th and early 17th centuries? This time we'll be looking into the mystery.


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

"Freemasonry," it is often rumored to be a secret society that has constant conspiracy theories, but it is originally said to be a fraternity group that learns and teaches each other's basic human morals. It is believed to have been founded in Scotland or England in the late 16th and early 17th centuries, and it is said that from then on there it has a diverse group of members around the world.

In English, individual members are called Freemasonry or Masonry, and when referring to an organization, they are called Freemasonry, or for short, Masonry.

The specific activities of the Freemasonry are private and shrouded in mystery, but according to the official website of Japan Grand Lodge, they carry out charity activities such as setting up schools and financial support for charity organizations . Non-members can participate in the Children's Festival (Masonic Children's Festival) held in May and the BBQ held in August.

Link: The Grand Lodge of Japan

This organization aims to "realize the ideal of brotherhood of all humanity" and "real and the ultimate ideal of civilization," and is said to be members of "Freemasonry." The founders of the Rotary Club, Lions Club, and other clubs, which have a long history. In other words, it is historically believed that various organizations were derived from the Freemasonry.

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

For some reason, there is a stone monument inscribed with the symbol of the mysterious secret society "Freemasonry" at the Sendai Castle Ruins (Aoba Castle Ruins).


"Right-angled ruler and compass with an upward facing triangle" engraved on a stone monument near the ruins of Ote Gate

Go straight down Aoba-dori from the center of Sendai city. Cross the Ohashi Bridge and on your left, you will find a three-way intersection, around the Sendai City Museum. Go straight at the three-way intersection and you'll reach Sendai Castle Otekadowaki Tower, and turn right to Miyagi Prefectural Art Museum.

Sendai Castle Otekadowaki Tower
Sendai Castle (Aoba Castle) Otekadowaki Tower

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

Freemasonry stone monument in a green area sandwiched between roads
Freemasonry stone monument in a green area sandwiched between roads

Drawing images. It's a little hard to understand, but the building seen at the back of the photo is listed on Google Maps as "Sendai Castle Otekadowaki Tower." And the small cube object seen in the center of the photo is the stone monument in question.

Freemasonry stone monument in a green area sandwiched between roads (enlarged)
Freemasonry stone monument in a green area sandwiched between roads (enlarged)

When you enlarge it, you will see that it is marked with a strange mark that is clearly not the remains of Sendai Castle (Aoba Castle). You can see the upward-facing right angle ruler and compass, and the alphabet "G" in the center. It is very similar to what is commonly the Freemasonry symbol

The right angle ruler with an upward-facing triangle is said to symbolize "morality" and the compass is said to symbolize "truth", and the central part of the ruler and compass is written largely with a G. It is said that the meanings of God, geometry, glory, Grandeur, Gold, and Gnosis are also encompassed in the G mark.


The qualification for membership in Freemasonry is to have some kind of faith.

Freemasonry may be of interest to you, but members of any religion such as Judaism, Christianity, Islam, or Buddhism can join, but atheists are not allowed to join.

Of the six 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 Grand Lodge of the Commonwealth. Furthermore, 2 million people belong to the Grand Lodge of the United States, and is said to be approximately 1,500, of which approximately 250 are Japanese


Why is it located on the Sendai Castle ruins? Is there a key to the history of Sendai Castle Ruins (Aoba Castle Ruins)?

The mystery of why such a "Freemason" stone monument is located at the Sendai Castle Ruins (Aoba Castle Ruins) can actually be solved by going back in history.

Sendai Castle (Aoba Castle) has a history of the occupying forces after the war, and it is said that at that time there was "Freemason Sendai Lodge" "the foundation stone of Freemason Sendai Lodge .

Currently, after the San Francisco Peace Treaty, the Honmaru and Ninomaru ruins of the Sendai Castle Ruins (Aoba Castle Ruins) are now the grounds of Tohoku University, and the Gokoku Shrine has been rebuilt on the Honmaru Ruins.

Isn't it possible to say that the mysterious "Freemason" stone monument is reminiscent of the post-war era when the US military existed?

"Demon Date Masamune, the first lord of Sendai Domain, was a member of the Freemasons," but this is unlikely to happen.

It is said that 2 million members of Freemasonry belong to the Grand Lodge of the United States, so the U.S. military's "Sendai Lodge" probably existed when the U.S. military was stationed there.

It is strange that the history of Sendai Castle Ruins (Aoba Castle Ruins) can be unraveled from a place like this.


Freemasonry Stone <Information>

  • Name: Freemasonry stone at Sendai Castle Ruins (Aoba Castle Ruins)
  • Address: Aobayama, Aoba Ward, Sendai City, Miyagi Prefecture 980-0856

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