1984 — Shoko Asahara, a visually impaired yogi, forms “AUM Shinsen no Kai,” later renames it AUM Shinrikyo. It mixes elements of yoga, Buddhism, and other religions and begins recruiting college students and intellectuals.
1987- AUM incorporates in New York City under the name Aum USA Company, Ltd. In the US it attempts to purchase military weapons, develop chemical weapons.
February 1989–AUM members strangle to death, 21-year-old Shuji Taguchi who had wanted to escape the group at its complex in Shizuoka Prefecture.
Nov. 4, 1989 — AUM members acting on orders from Asahara, kill the lawyer Tsutsumi Sakamoto, his wife and their 1-year-old son at their home in Yokohama. The lawyer had been part of growing vocal opposition to the group.
1990 — Asahara and 24 other disciples run unsuccessfully in a parliamentary election. The defeat spurs Asahara to begin plans to take over the country and began developing chemical weapons. The group also began manufacturing methamphetamines and small-scale incinerators which they sell to the Yamaguchi-gumi and other yakuza groups to raise funds.
1993-AUM purchases a 500,000 acre sheep farm in Australia where they test out sarin gas, leaving behind 29 dead sheep.
AUM begins training helicopter pilots in the United States in hopes of eventually dispersing sarin gas over the Tokyo via helicopter. Plans for launching an attack within the US are also considered.
June 1994-AUM purchases a helicopter from Russia
June 27 — AUM members test sarin nerve gas in a residential area of city of Matsumoto, Nagano Prefecture. Eight people are killed, 100 injured.
December 12–AUM members kill a member, Tadahito Hamaguchi, with highly toxic VX gas on an Osaka street. He was suspected of being an informant.
January 1,1995–Yomiuri Newspaper publishes on their front page a special report that the police had found elements of Sarin gas in the ground near AUM facilities in Yamanashi Prefecture, linking the cult to the 1994 attack.
February 28,1995-AUM members abduct Kiyoshi Kariya, 68, to find his sister who wanted to leave the group. He dies under interrogation and his body is incinerated in a cult-built microwave heating device. (This and the other murders were later referenced in the series Millennium episode 2, Gehena).
March 20,– AUM members release sarin gas on Tokyo subway system. Thirteen people are killed and over 6000 injured. Police immediately suspect AUM.
April 23, AUM leader in charge of “Science Technology” and conduit to organized crime, Hideo Murai, is stabbed to death by a Yamaguchi-gumi members in front of the group’s headquarters, while reporters watch. The spokesman for the group says, “I heard that Murai was killed by the Jews.”
May 5–AUM members plant a cyanide bomb in the bathroom of an underground passage connected to Shinjuku stations, near the ventilation system. The poisonous fumes would have killed thousands if the bomb hadn’t been found.
May 16 — Asahara is arrested.
2000-AUM officially disbands and reforms under the name Aleph.
Feb. 27, 2004 — The Tokyo District Court sentences Asahara to death.
Sep. 15, 2006 — Asahara’s death sentence is finalized.
Aleph splits into another faction, Hikari no Wa. Later, a third faction of the group emerges.
June 15, 2012 — The last fugitive former AUM member, Katsuya Takahashi, is arrested for his part in the subway attacks.
Jan. 18, 2018 — The Supreme Court rejects Takahashi’s appeal, ending all trials linked to AUM Shinrikyo cult.
July 6, 2018 — Asahara and six others are executed by hanging. Seven members remain on death rows while their cases are being appealed.