None. When the art of Jujutsu was translated from the Japanese language into the Romanized languages like English, there was no established way of spelling it correctly.

Also depending on the dialect of the Japanese speaker it may have sounded different to the person doing the translation. Different standards have been adopted over time that is why there are many different spellings.

There are other names for Jujutsu including Aiki jutsu, Aiki jujutsu, Yawara, and Taijutsu. And Jujutsu is a foundation art for non-Japanese arts like Hapkido.

Of course there are many styles of Jujutsu including modern styles like Gracie, Small Circle, Danzan and Budoshin Jujutsu.

The founder of Aikido and Judo studied Jujutsu. Additionally it the parent art of Kempo Karate, and other Karate styles such as Wado Ryu Karate.

No one knows for sure. We only know that it was systematized by the Samurai warrior as early as the mid 15^th century.

The Samurai was trained in many weapons and most modern martial artists are aware of the Samurai sword.

Miyama Ryu was created as a response to attacks as they occurred to people on urban streets.

He felt that the Japanese arts in their classical forms were based on different attacking formats and therefore did not provide immediate answers for modern self defense.

When we say combat we mean defense against attacks as they would actually occur on the streets. Some Jujutsu styles have perpetuated the myth that fighting someone for 45 minutes on the ground is self-defense.

Of course your own common sense would tell you that rolling around on the streets of New York or any major city for 45 minutes with an armed attacker or multiple attackers would mean certain death.

The night stick, collapsible baton (Tokusho Keibo), Walking stick (Tanjo). The Founder also encouraged training in the classical arts of Iaido, Kendo, Kenjutsu and Jo (also called Jodo and Jojutsu). Additionally knife fighting (tanto) was also taught. Based on the hand-to-hand combat training Shinan Pereira learned in World War II.

Yes two-man Kata is used. Also Miyama Ryu practitioners study Kodokan Kata and Kata from other Koryu styles such as Sosuishi (Sosuishitsu) Ryu.

Miyama Ryu is not a Gladiator type sport. Miyama Ryu was designed so a normal person could learn how to defend themselves against violent criminals.

These attacks include defenses against weapons and multiple attackers, which are not addressed in sport type martial arts. The training necessary to defend yourself is different from preparing for a sporting competition.

Miyama Ryu techniques are the classical techniques developed by the Samurai warriors refined for modern street attacks.

We have hundreds of testimonials from people of all walks of life who have successfully defended themselves in real life situations over the past forty years.

Each Dai-Shihan has various Dojos internationally that he has certified. A Dai-Shihan may designate any dojo under his authority as his Hombu dojo.

So theoretically it is possible to have zero to three Miyama Ryu Hombu dojos.