Question: Iwama dojo was built by what martial artist who is often referred to as the founder, Kaiso, or Great Teacher?

full_context: Document 1: Hitohiro Saito: Hitohiro Saito (斎藤 仁弘 "Saitō Hitohiro", born 12 February 1957 in Iwama) is an aikido instructor and founding headmaster of Iwama Shin-Shin Aiki Shuren-kai. Hitohiro is the son of Morihiro Saito. At age of seven, he started to learn aikido from Morihei Ueshiba, the founder of aikido, who cared for him as a grandson. . After Ueshiba died in 1969, he continued his practice with his father. The younger Saito became an official instructor of the Iwama dojo in 1986 and remained so until 2004 when he separated from the Aikikai organization and formed his own group. Since 2009 he is also identified as Hitohira (仁平) Saito.
Document 2: Kume no Heinai-dō: Kume no Heinai-dō (久米平内堂 ) is a small folk shrine located in Asakusa in Taitō, Tokyo. The shrine houses a stone statue of Kume no Heinai, a samurai from the early Edo period (17th century). According to the Asakusa tourism bureau, there are few facts about the life of Kume no Heinai, but he is said to have died in 1683. Oral tradition holds that Heinai excelled in Kenjutsu, the martial art of swordsmanship, killing many people over the years. In the latter half of his life, he is said to have lived in the Sensō-ji temple in Asakusa where he devoted himself to Zen-Buddhism and held religious services in honor of the people he killed. Shortly before his death he ordered his followers to carve his likeness on a stone and bury it near the Niōmon – the entrance to the Buddhist temple and a busy district in the city. His wish was to have his statue be stepped on by as many people as possible in order to expiate the crimes he committed in life. The statue was eventually retrieved and is now stored inside the shrine itself. It is because of this that the shrine initially carried the name "Fumitsuke" (踏みつけ ) , which means "to tread on", but over time the meaning was lost and the shrine's name came to be spelled 文付け, which means "love letter". Both words are pronounced "Fumitsuke" and the shrine is now worshipped by the general public as a deity of marriage and match-making. Kume no Heinai-dō was destroyed in March 1945 during World War II. The current temple was rebuilt in October 1978.
Document 3: Iwama dojo: Iwama dojo is a dojo built by the founder of aikido, Morihei Ueshiba, who lived there from 1942 until his death in 1969. It is located in the former town of Iwama and became an important historical location for the development of aikido and "a Mecca to the aikido community." This dojo is also where Morihiro Saito, one of the founder's closest students, learned and taught aikido from 1946 until 2002 developing what is often referred to as the Iwama Style.
Document 4: Nobuyoshi Tamura: Nobuyoshi Tamura (田村 信喜 , Tamura Nobuyoshi , 2 March 1933 in Osaka – 9 July 2010) was a prominent aikidoka and a direct student of Morihei Ueshiba. The son of a kendo teacher, Tamura entered the Aikikai Hombu Dojo in 1953 as an uchi-deshi (live-in student) of aikido founder Morihei Ueshiba. He was one of Ueshiba's favorite pupils and since 1964 has greatly contributed to the development of aikido in Europe and France in particular. He was the National Technical Director (DTN) of the FFAB (French Federation of Aikido and Budō). He held the rank of 8th dan and the title of Shihan. Throughout his teaching career he trained many others instructors in various countries around the world but foremost Western Europe. In 1999, he received the medal of "Chevalier de l'ordre National du Mérite" from the French government. Tamura published several books on aikido in French. His dojo, Shumeikan Dojo, is located in the village of Bras, France.
Document 5: Kinomichi: Kinomichi (氣之道 ) is a martial art in the tradition of budō, developed from the Japanese art aikido by Masamichi Noro and founded in Paris, France, in 1979. Masamichi Noro was one of the live-in students ("uchideshi") of Morihei Ueshiba, the founder of aikido. Designated "Delegate for Europe and Africa" by Morihei Ueshiba, Noro debarked in Marseille on September 3, 1961, preceding Nakazono and Tamura in the communal construction of a European and African aikido. In France, Kinomichi is affiliated with the Fédération Française d’Aïkido, Aïkibudo et Affinitaires (FFAAA) and maintains warm relations with the Aikikai Foundation and its leader, Moriteru Ueshiba, the grandson of aikido’s founder.
Document 6: Morihiro Saito: Morihiro Saito (斉藤 守弘 "Saitō Morihiro", March 31, 1928–May 13, 2002) was a teacher of the Japanese martial art of aikido, with many students around the world. Saito's practice of aikido spanned 56 years, from the age of 18, when he first met aikido founder Morihei Ueshiba, until his death in 2002.
Document 7: Daitō-ryū Aiki-jūjutsu: Daitō-ryū Aiki-jūjutsu (大東流合気柔術 ) , originally called Daitō-ryū Jujutsu (大東流柔術 , Daitō-ryū Jūjutsu ) , is a Japanese martial art that first became widely known in the early 20th century under the headmastership of Takeda Sōkaku. Takeda had extensive training in several martial arts (including Kashima Shinden Jikishinkage-ryū and sumo) and referred to the style he taught as "Daitō-ryū" (literally, "Great School"). Although the school's traditions claim to extend back centuries in Japanese history there are no known extant records regarding the "ryū" before Takeda. Whether Takeda is regarded as either the restorer or the founder of the art, the known history of Daitō-ryū begins with him. Takeda's best-known student was Morihei Ueshiba, the founder of aikido.
Document 8: Iwama style: Iwama Style Aikido is the style of aikido that was taught at Iwama dojo (in Iwama) by the founder of aikido, Morihei Ueshiba, and especially the lineage passed on through Morihiro Saito, a close disciple who was given responsibility over Iwama dojo by Ueshiba.
Document 9: Noriaki Inoue: Noriaki Inoue (1902-12-03, Tanabe – 1994-04-13, Kunitachi) was a Japanese martial artist, who was in his early years closely associated with the spiritual and technical development of aikido along with his uncle Morihei Ueshiba. Inoue is the founder of Shinwa Taidō, a martial art which he later renamed to Shin'ei Taidō.
Document 10: Ansei Ueshiro: Ansei Ueshiro (宇江城 安盛 , Ueshiro Ansei , April 20, 1933 - May 7th, 2002) was an influential Okinawan martial artist, who was the nephew of Ankichi Arakaki, the chief instructor at the original Nagamine Dojo in Okinawa and the composer of Fukyugata Sandan kata. Born in Kin, Okinawa, Ueshiro relocated to the United States in 1962 at the request of founder Shōshin Nagamine of Matsubayashi Shōrin-ryū, under whom he had studied, for the purpose of spreading the martial art. He founded Shorin-Ryu Karate USA and, according to that organization's official website, "was one of the first Oriental martial artists to bring karate" to the US.
Document 11: Yutaka Kurita: Yutaka Kurita (栗田 豊 , Kurita Yutaka ) (born 20 April 1940 in Tokyo, Japan) was one of the last live-in students ("uchideshi") of the founder of aikido, Morihei Ueshiba. He entered the Aikikai Hombu Dojo in 1956 and after a year as a regular aikido student was accepted as an "uchideshi" by Ueshiba and went with him to live, work and train at the Iwama dojo. He received his 3rd dan (sandan) directly from Ueshiba and served him as his assistant/attendant, scribe, "uke", and assisted in instructing when people came from Tokyo to Iwama to study aikido.
Document 12: Morihei Ueshiba: Morihei Ueshiba (植芝 盛平 , Ueshiba Morihei , December 14, 1883 – April 26, 1969) was a martial artist and founder of the Japanese martial art of Aikido. He is often referred to as "the founder" "Kaiso" (開祖 ) or "Ōsensei" (大先生/翁先生 ) , "Great Teacher".
Document 13: Kenshiro Abbe: Kenshiro Abbe (阿部 謙四郎 , Abe Kenshirō , 15 December 1915 – 1 December 1985) was a prominent Japanese master of judo, aikido, and kendo. He introduced aikido to the United Kingdom in 1955, and founded the Kyushindo system. Abbe was a graduate of the Budo Senmon Gakko, having studied judo and kendo there. Following an illustrious early career in the martial arts, he served in the Imperial Japanese Army before and during World War II. He then trained in aikido under its founder, Morihei Ueshiba, for a decade. Abbe held "dan" ranks in several martial arts, most notably 8th "dan" in judo, 6th "dan" in aikido, and 6th "dan" in kendo. After introducing aikido to the UK, he established several Japanese martial arts councils there during the late 1950s. He returned to Japan in 1964 and remained there for most of the remainder of his life. There are contradictory accounts of Abbe's final years, but it appears that he was in poor spirits and poor health towards the end.
Document 14: Aikido: Aikido (Japanese: 合気道 , Hepburn: aikidō ) ] is a modern Japanese martial art developed by Morihei Ueshiba as a synthesis of his martial studies, philosophy, and religious beliefs. Aikido is often translated as "the way of unifying (with) life energy" or as "the way of harmonious spirit".
Document 15: Hiroshi Isoyama: Hiroshi Isoyama (磯山博 , Isoyama Hiroshi ) is a Japanese teacher of the martial art of aikido. He began training in the Iwama Dojo at the age of 12 as a direct student of the founder of aikido, Morihei Ueshiba in June 1949. He currently holds the rank of 8th dan shihan in the Aikikai and is that organization's Technical Councillor. Isoyama was made the acting head of the Iwama dojo on behalf of Ueshiba Moriteru following the passing of Morihiro Saito. He currently remains as Executive Advisor and senior instructor of that dojo.
ground_truth: Morihei Ueshiba