A rough timeline of events in Ao no Exorcist. Due to lack of manga canon dates for events, everything is organized in relation to the first chapter/episode, and the 1995 birthdate from the anime will be ignored. Due to the nature of a timeline page, all of the spoilers will remain untagged. Read at your own risk.
100+ years ago
- The Ba'al have a meeting. Lucifer declares his intention to end his existence and take human kind with him. Mephisto convinces him to give human science a chance.
- Section 13 is formed, cloning experiments begin.
- The lab changes focus to production of clones only of the hosts of the top three Demon Kings; Lucifer, Samael, and Azazel.
- Cloning is found to be an imperfect solution. Despite being genetically identical, personalities still vary enough to make most clones useless as hosts.
- Section 13 again changes focus to elixir development.
50 years before the series begins
- Shirou Fujimoto is born.
45 years pre series
- Yuri Egin is born, abandoned in a junkyard, found by retired exorcist Oku-san, and adopted by him and his friends.
39 years pre series
- Shirou runs away from Section 13.
- Yuri encounters Rinka for the first time.
- Yuri's family dies in a fire.
- Yuri encounters Shiro.
- Shirou gets caught by Section 13 guards, and he and Yuri are both brought back to the Order.
- Yuri is put into Asylum, meets Rick for the first time, and decides she wants to become an exorcist.
- Shirou demands to become an exwire and agrees to make a deal with Mephisto.
34 years pre series
- Shirou is an Exwire.
- Yuri is a Page.
- Shirou and Yuri meet for the second time.
28 years pre series
- Section 13 lets Shirou go.
- Shirou and Yuri are both made full exorcists.
- Abel Franken is Paladin.
- Yuri and Shirou manage to become friends.
19 years pre series
- Satan incarnates fully in Assiah for the first time.
- Yuri is recruited into Section 13 to handle Satan.
18 years pre series
- Satan starts calling himself Satan, develops beyond his initial childlike persona.
- Satan breaks out of Section 13 and disappears.
16 years pre series
- Satan returns, takes over Section 13.
- The Siege of True Cross happens.
- Yuri goes to Satan.
- Yuri gets pregnant.
- Jenny dies.
- Yuri convinces Satan to end the siege and run away with her.
- Yuri and Satan are caught and imprisoned.
15 years pre series
- Rin and Yukio are born.
- Satan's host dies.
- Drac has his big breakthrough.
- The Blue Night takes place.
- Rin is sealed.
- Paladin Abel Franken is killed by Satan.
- Shirou Fujimoto is possessed by Satan for the first time.
- Yuri Egin dies.
- Rick dies.
- Many people die.
- Saburota Todou kills his family.
- Shirou is promoted to Paladin.
- Mephisto and Lucifer both promise Satan a new body.
- The Illuminati begins to take shape.
- Arthur is taken in by the Uzai.
- Shirou Fujimoto takes up residence in Southern Cross Boys Home, ends up gathering several fellow Blue Night survivors to live there too.
8 years pre series
- Yukio begins exorcist training.
- Rin awakens his powers.
- Shirou Fujimoto is possessed by Satan and dies.
- Rin is approached by Mephisto and volunteers to become an exorcist.
- Both regular and Cram school classes begin.
- Rin is still alienated from the rest of the class.
- The exwires go to Kyoto.
- Rin gets arrested.
- Toudou is revealed to be the traitor.
- The Impure King is revived.
- The exwires break Rin out.
- Karura is stolen and eaten by Toudou.
- The Impure King is defeated.
- There is a Kraken.
- Character development happens.
- Time for the school festival.
- The Illuminati attacks True Cross and kidnap Izumo.
- Shima is revealed to be a traitor.