Question: What modern Japanese martial art was developed by Morihei Ueshiba, often referred to as"the founder" "Kaiso" or "Ōsensei"?

full_context: Document 1: 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 2: 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 3: Jeet Kune Do: Jeet Kune Do (; ), abbreviated JKD, is a hybrid philosophy of martial arts heavily influenced by the personal philosophy and experiences of martial artist Bruce Lee. Lee, who founded the system on July 9, 1969, referred to it as "non-classical", suggesting that JKD is a form of Chinese Kung Fu, yet without form. Unlike more traditional martial arts, Jeet Kune Do is not fixed or patterned, and is a philosophy with guiding thoughts. It was named for the Wing Chun concept of interception or attacking while one's opponent is about to attack. Jeet Kune Do practitioners believe in minimal movement with maximum effect.
Document 4: 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 5: 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 6: 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 7: Kanō Jigorō: Kanō Jigorō (嘉納 治五郎 , 28 October 1860 – 4 May 1938) was a Japanese educator and athlete, the founder of Judo. Judo was the first Japanese martial art to gain widespread international recognition, and the first to become an official Olympic sport. Pedagogical innovations attributed to Kanō include the use of black and white belts, and the introduction of dan ranking to show the relative ranking among members of a martial art style. Well-known mottoes attributed to Kanō include "Maximum Efficiency with Minimum Effort" （精力善用 "Sei-ryoku Zen-you"）and "Mutual Welfare and Benefit"（自他共栄 "Ji-ta Kyou-ei"）.
Document 8: 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 9: 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 10: 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 11: Aiki (martial arts principle): Aiki from a Japanese budo term, at its most basic is a principle that allows a conditioned practitioner to negate or redirect an opponent's power on contact. When applied, the Aiki practitioner controls the actions of the attacker with minimal effort and with a distinct absence of muscular tension usually associated with physical effort.
Document 12: 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.
Document 13: 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 14: 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 15: 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.
ground_truth: Aikido