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Timeline:

1945
After World War II, the United Nations is founded by many of the nations
of the world in order to preserve a global sense of community.

2010
The potential of magic is realized and magic begins to be studied as a
science. However the name of the person who first revealed the secrets of
magic has been lost.

2014
The "Gear Project", a project dedicated towards the evolution and
strengthening of mankind, begins. However its nature and full purpose are
unknown.

2016
Frederick, the first prototype in the Gear Project, escaped the laboratory
shortly after undergoing the Gear conversion. Along the same time the
rest of the laboratory personnel, starting with "That Man", diesappear -
the Gear Project grinds to a halt. Frederick, now no longer human,
designs a Gear Cell Control Device in order to maintain a human appearance.

2073
That Man completes a "Perfect Gear" archetype, sort of the essence of
Justice, that is subservient to mankind. A certain major country restarts
the Gear Project. Frederick, learning of That Man's plans, begins designing
the Outrage.

2074
That certain major country attempts to use Gears to overwhelm other
countries. However, the Gear who possessed his own free will and incredible
strength, Justice, had been born. As planned by That Man, other Gears
became followers of Justice and turned against mankind. Gears attacked
and destroyed the country of Japan. This led to the formation of the
Holy Order and the beginning of the Holy War.

2099
A 6-year-old Kliff is saved from a Gear attack by Frederick.

2172
A certain "Sol" is recruited by Kliff into the Holy Order. Eventually,
disenchanted by the Order's methods, Sol leaves at an unspecified date,
taking the Order's treasured sword "Fuuenken" with him.

*2173*
At the Battle of Rome, the Holy Order is handed a crushing defeat. Most
significantly, Ky Kiske is killed by a Gear. Just before dying, he entreats
Sol Badguy to take on the leadership position of the Order.

*????*
Johnny is killed in the Holy War. Command of the Jellyfish passes to May.
Justice is killed in the Holy War. Embittered, her daughter, Dizzy, takes
control of the Gears.

*2183*
I-No kills Baldhead, who never regained his sanity, and discovers on his
body the location of the Gear Plant, which he took from some soldiers he
'operated on'. She gives the information to Sol Badguy. Sol leads an all-
out attack on the Gear Plant, but they are no match for Dizzy. Testament
kills Potemkin, and Dizzy destroys the Jellyfish and fights with Sol.
Meanwhile, I-No sneaks into the now-abandoned Gear Plant and meets That
Man, who is being held captive by the Gears. That Man explains to I-No
that he never intended this kind of future when he created Gears.
Intrigued, I-No uses her power to jump through time to return to 2173 and
change history.

2173
I-No arrives back in time at the Battle of Rome and saves the life of Ky
Kiske. She then erases his memory (?) and officially joins That Man.

2175
With the sealing away of Justice, the long Holy War comes to an end. The
Holy Order is disbanded and mankind lives in peace.
(AKA Justice's Story Mode in Guilty Gear XX)

2180
Unease spreads around the world as rumors of a "Justice Revival" spread.
To quell the rumors and prepare for the worst, the countries form the
Second Holy Order and sponsor the Second Holy Order's Fighting Tournament
(AKA the first Guilty Gear game). Justice is destroyed by Sol and other
Gears lose their ability to act.

2181
The Blackard incident (Lightning the Argent) occurs, and a Gear with free
will known as Solaria is created by the company. However, Ky stops their
plan of using her as a command-type Gear, and she lives peacefully as a
human under the auspices of the Police force.
Rumors spread that in A Country a Gear with free will is found.
Panicked countries sponsor another fighting tournament with a bounty of
50,000,000 World Dollars to whoever can eliminate this Gear (AKA Guilty
Gear X). Sol defeats the Gear, Dizzy, but does not kill her. Ky meets
her soon afterwards and similarly does not kill her. Dizzy meets Johnny
and is adopted into the Jellyfish pirates. Dizzy is "officially" dead
and Jam claims the bounty.
A few weeks later a servant of That Man known as I-No begins stirring up
trouble... (AKA Guilty Gear XX).

2182
Events from The Butterfly And Her Gale occur. Chipp Zanuff finally gets
revenge against the man who killed his master, Volf of the Assassins.
Serving as the bodyguard of the President of the A Country (formerly the
US), Erica Bartholomew, Chipp helps to pass an official cutting-of-ties
between A Country and the Assassin Syndicate. A Country also allies with
Zepp.