==Timeline==
===3000 BC===
*The earliest form of games originate from this period.
===1000 BC===
*The Egyptian kingdom is being attacked by invaders.
*[[Aknadin]] deciphers parts of the [[Ancient Book of Millennium Magic]]
and prepares the ritual for creating the [[Millennium Items]].
*Aknadin departs to [[Kul Elna]] with an army to slaughter 99 people for the ritual.
*The Millennium Items are created from the villagers' boiled bodies.
*Aknadin returns to the palace with the creations and gives each Item to their designated holder.
*With the help of the Millennium Items, the invaders are repelled and defeated.
*Egyptian magicians seal monsters in stone tablets and summon them to
fight battles in the Pharaoh's court. Their legend is later recorded in
the Book of Thoth.
*The [[Dark Yugi|Pharaoh]] seals himself into the [[Millennium
Items#Millennium Puzzle|Millennium Puzzle]] along with the [[Dark
Priest]] (who manages to seal part of himself into the [[Millennium
Ring]]) and erases his own memories.
===1920===
*October 4 - [[Sugoroku Muto]] is born.
===1960===
*Sugoroku visits the Valley of the Kings in order to play the "ultimate
game". He obtains the Millennium Puzzle in the Pharaoh's Tomb.
===1966===
*August 12 - [[Bandit Keith]] is born.
===1968===
*''[[Cyndia]] is born.''
*October 8 - [[Pegasus J. Crawford]] is born.
*November 20 - [[Mai Kujaku]] is born.
===1972===
*April 5 - [[Ishizu Ishtar]] is born.
===1973===
*March 1 - [[Ryota Kajiki]] is born.
===1975===
*April 1 - [[Esper Roba]] is born.
===1976===
*''January 25 - [[Jonouchi Katsuya]] is born.''
*''February 28 - [[Ryuji Otogi]] is born.''
*''April 19 - [[Honda Hiroto]] is born.''
*''June 4 - [[Yugi Moto]] is born.''
*''August 18 - [[Anzu Mazaki]] is born.''
*''September 2 - [[Ryo Bakura]] is born.''
*''October 25 - [[Seto Kaiba]] is born.''
*December 23 - [[Marik Ishtar]] is born.
===1977===
*December 29 - [[Dinosaur Ryuzaki]] is born.
===1978===
*Pegasus and Cyndia meet at a social function.
*July 21 - [[Insector Haga]] is born.
===1981===
*July 7 - [[Mokuba Kaiba]] is born and his and Seto's mother dies shortly after.
===1984===
*Seto's and Mokuba's father dies in an accident.
*Yugi receives the Millennium Puzzle from Sugoroku as a memento.
===1985===
*Cyndia dies of an unknown illness. Pegasus is devastated.
===1986===
*Seto and Mokuba are put into an orphanage when their relatives ate up their inheritance.
*[[Kaiba Gozaburo]] adopts the brothers after Seto wins the set-up chess game.
*''Pegasus goes to Egypt after getting interested in the concepts of the
Egyptian afterlife. He encounters [[Shadi]] in Kul Elna and gains the
[[Millennium Items#Millennium Eye|Millennium Eye]].''
*''Pegasus gets brainwashed by the Eye, discovers the tablets with the monsters housed in them and creates [[Duel Monsters]].''
*''Pegasus founds [[Industrial Illusions]]''.
===1987===
*Fueled by his rage against the ancient traditions of the tombkeepers
and the hardships they forced him and his family to endure, Marik's rage
personifies into a second, darker personality for the first time and
slays his own father.
*Marik obtains the [[Millennium Items#Millenium Rod|Millennium Rod]] and
Ishizu obtains the [[Millennium Items#Millennium Necklace|Millennium
Necklace]].
*''Pegasus departs to Egypt again in order to look for the tablet with the Egyptian Gods. He finds it with Shadi's guide.''
*''Pegasus returns to the USA to create the [[Egyptian God Cards]]. He
considers their creation his biggest mistake and returns to Egypt once
again to seal them away.''
*''Pegasus meets Ishizu in Egypt who then takes the God Cards from him.''
===1992===
*Seto takes over [[Kaiba Corporation]] and Gozaburo commits suicide.
*Yugi solves the Millennium Puzzle and unseals [[Dark Yugi]] at the same time.
===2004===
===2005===
===2006===
===2007===
===20XX===
*Paradox encounters Yusei and takes his Stardust Dragon.
*Yusei goes through a time slip.
===????===
*[[Paradox]] departs from his time into the past.
==References==
*The first series' period can be determined from Kazuki Takahashi mentioning in [
http://shinhoroko.livejournal.com/5218.html
The Super Long Interview With Kazuki Takahashi-sensei] that [[Sugoroku
Muto]] was forty years old when he went to Egypt to take part in the
"ultimate game" and obtain the Millennium Puzzle. According to Battle
279 of the manga, this occurred in 1960. In the Gospel of Truth,
Sugoroku is listed as 72 years old in the present day, therefore the
series is set in 1992. After [[Duelist Kingdom]], Yugi states that they
have advanced a grade in school. With this information in mind, it could
be said that the events of the series happened in about a year and a
half.
*For GX, dates were occasionally shown in the anime, such as [[Marufuji
Ryo]] graduating from the [[Duel Academia]] in 2004 and [[Judai Yuki]]
starting his studies in 2004 (Episode 156).
*For 5D's, the date is explicitly shown in Ride 01 of the [[Yu-Gi-Oh! 5D's (manga)|5D's manga]].
*The characters' birthdays are listed in the [[Gospel of Truth]].
*Yugi, Anzu, Honda, Jonouchi, Kaiba, Ryo, Ryuji are listed as "second
year in high school" in the Gospel of Truth. This would make all of them
about 16 years old.
*In Vol. 5, Duel 40 of the manga, Mokuba mentions "When Seto-sama was
ten and I was five...", making the age difference five years between
them. Thus, Mokuba was born in 1981.
*Cyndia's day of birth was never stated, but it is known she died at the
age of 17, shortly after Pegasus' 17th birthday. This would make her
slightly older than him.
*Cyndia's death happened shortly after Pegasus' birthday. Pegasus stated
that "for months he stared at the white canvas of his heart". Again,
his birthday is in October, so after a few months of grieving a new year
has surely begun.
*Ishizu said that the tragedy of the Ishtars occurred five years before
Battle City. If we go by the anime, Pegasus met Ishizu when he intended
to seal the God cards in Egypt, at which time she already had the
Necklace. Before the tragedy the Necklace was kept in the temple along
with the Rod. Therefore Pegasus could've created the God cards five
years ago. When he found the Gods' tablet, he also claimed his game
would be finally complete. Thus creating and finishing the card game in a
span of two years would make sense.