is one of the oldest extant Japanese martial arts and an exemplar of bujutsu. It was founded by Iizasa Ienao, who lived near Katori Shrine (Sawara City, Chiba Prefecture) at the time. The ryà « is purported to have been founded in 1447, but some scholars state that it was about 1480.
Iizasa Ienao (飯篠éÂጬÂæ 家ç´ Iizasa Chà Âi-sai Ienao, 1387 â c. 1488) was a respected spearman and swordsman whose daimyà  was deposed, which encouraged him to relinquish control of his household to conduct purification rituals and study martial arts in isolation.
Iizasa was born in the village of Iizasa in Shimà Âsa Province. When he was young, he moved to the vicinity of the famous Katori Shrine, northeast of Tokyo in modern-day Chiba Prefecture. The shrine's kami, Futsunushi () is revered as a spirit of swordsmanship and martial arts.
In 1896, the 18th sà Âke died without a male heir. Shihan Yamaguchi Eikan governed the school until his death on 14 March 1917. Until Iizasa Kinjiro married into the Iizasa household, the school was headed in order by nine instructorsâÂÂTamai Kisaburo, Shiina Ichizo, Ito Tanekichi, Kuboki Sazaemon, Isobe Kohei, Motomiya (Hongu) Toranosuke, Hayashi Yazaemon, Kamagata Minosuke, and the main instructor Yamaguchi.
On 6 March 1960, the school received the first ever "Intangible Cultural Asset" designation given to a martial art by the Japanese government, naming Hayashi Yazaemon, à Âtake Risuke, and Iizasa Yasusada as its guardians. The Iizasa family dojo was also designated a Cultural Asset. The designation of Cultural Asset status shifted to the Chiba Prefectural Government in 1985 and the art was recertified, again naming à Âtake Risuke and Iizasa Yasusada as guardians. à Âtake Nobutoshi and Kyà Âsà  Shigetoshi were also certified as guardians on 30 March 2004.
Iizasa Yasusada has publicly recognised the Otake and Sugino dojo. Both dojo represent the school annually at the Meiji Jingu embu.
Kyà Âsà  Shigetoshi was appointed shihan in September 2017, and à Âtake Nobutoshi was issued hamon (excommunicated) on 9 December 2018. However, both Otake Risuke, Otake Nobutoshi and Kyà Âsà  Shigetoshi are still recognised as guardians of the school, by the Chiba Prefecture Board of Cultural Affairs.
The Tenshin Shà Âden Katori Shintà Â-ryà « is a comprehensive martial system. Unlike modern martial arts such as kendo or iaido, which concentrate on one specific area of training, a broad range of martial skills is studied.
The main emphasis of the school is kenjutsu. A wide range of other weapons are taught as part of the curriculum, but the sword remains the central weapon.
The primary curriculum includes:
The Gogyo and Gokui kata are only taught to advanced practitioners after years of fundamental practice.
Other, more advanced areas of study of the school include:
Historically, before beginning any training in Tenshin Shà Âden Katori Shintà Â-ryà «, every prospective pupil had to swear an oath of allegiance to the school. The method was to make keppan (blood oath) in support of the following kisho or kishomon (pledge). This oath was a written one with the prospective member being required to sign his name in his own blood. The applicant would prick or cut a finger or sometimes the inner arm and with the blood drawn, sign the following pledge:
<blockquote> On becoming a member of the Tenshin Shà Âden Katori Shintà Â-ryà « which has been transmitted by the Great Deity of the Katori Shrine, I herewith affirm my pledge that:
I hereby pledge to firmly adhere to each of the above articles. Should I break any of these articles I will submit to the punishment of the Great Deity of Katori and the Great Deity Marishiten. Herewith I solemnly swear and affix my blood seal to this oath to these Great Deities. </blockquote>
Tenshin Shà Âden Katori Shintà Â-ryà « is currently represented by the Kyà Âsà  Shibu led by Kyà Âsà  Shigetoshi, à Âtake Risuke's younger son. The honbu dojo is located at Iizasa Yasusada's home near the Katori shrine and is used by branches in good standing on special occasions. The Kyà Âsà  Shibu regularly trains out of the Shisui Town Community Plaza and the Matsuyamashita Koen Sports Gymnasium in Inzai City. Several branches have existed alongside or split from the mainline with varying ties to the Iizasa family, such as Noda, Yoseikan, Shinbukan, Sugino, Hatakeyama, Sugawara.
The different branches recognize different levels of ranks and appointments. The traditional ranks are a variant of the menkyo system.
The Sugino line uses the modern dan system, out of respect for Yoshio Sugino's (10th dan) judo teacher Kanà  Jigorà Â, who was a pioneer of the dan-i ranking system. Sugino dojo members also receive densho/makimono.
The Hatakeyama line (which has no current headmaster) uses the modern dan system alongside the traditional menkyo system, issuing ranks in both with shà Âden/chà «den/okuden gradations to create equivalent ranks from the menkyo system.
Sugawara Sogo Budo issues mokuroku and menkyo certifications. The highest level is menkyo kaiden. English-speaking members of Sugawara Budo refer to the rank of menkyo as a "kyà Âshi license" or menkyo kyà Âshi.
Noda Shinzan (1848âÂÂ1917) began training in Katori Shintà Â-ryà « in 1853 under Yamada Naomune, a retainer of the Date clan. Many Date retainers had trained in Katori Shintà Â-ryà « and developed their own distinctive style. After Naomune's death in 1912, Shinzan enrolled his grandson, Seizan, under Yamaguchi Kumajiro, the most senior mainline shihan at the time. Following the deaths of Yamaguchi and his grandfather, Noda Seizan continued to train under Motomiya Toranosuke. After Motomiya's passing, Noda studied with Hayashi Yazaemon who began reforming and standardizing the mainline curriculum. Finding his style incompatible with Hayashi's, Noda Seizan quietly withdrew to private teaching, referring to his branch as Noda-ha Katori Shintà Â-ryà «. Noda-ha preserves some kata that have been lost in the mainline.
Shiigi Munenori began training in Katori Shintà Â-ryà « under his father, who had trained with Motomiya Toranosuke, before formally training at à Âtake Risuke's dojo for over thirty years. He incorporates Katori Shintà Â-ryà « as part of the curriculum of his Ichigidà  organization and maintains a positive relationship with the Iizasa family. He writes "Tenshin Shà Âden Katori Shintà Â-ryà «" as "天çÂÂæ£ä¼Âé¦ÂÃ¥ÂÂç¥ÂÃ¥ÂÂæµÂ" using 'Ã¥ÂÂ' (sword) in place of 'éÂÂ' (way).
Mochizuki Minoru, a 8th dan judoka from the Kodokan and 10th dan aikidoka under Ueshiba Morihei, trained alongside Sugino Yoshio, and incorporated Katori Shintà Â-ryà « into the curriculum of Budo Yoseikan. His son, Mochizuki Hiro, founded Yoseikan Budo.