This timeline is the work of watching episodes and sometimes a little guesswork. Therefore it might not be 100% correct.

Avatar Kuruk tries to kill Koh, the Face Stealer.c. -900The Siege of the North, Part 2
Avatar Kyoshi born.c. -400The Warriors of Kyoshi
Avatar Kyoshi kills General Chin and creates Kyoshi island.c. -370Avatar Day
Fire Lord Sozin born.c. -182no episode
Avatar Kyoshi dies.c. -170Avatar Escape Online Comic - Kyoshi
Aang born.c. -112The Boy in the Iceberg
Avatar Roku dies.c. -112The Spirit World (Winter Solstice, Part 1)
Aang runs away and gets frozen in an iceberg with Appa.c. -100The Boy in the Iceberg
Birth of Fire Lord Azulon.c. -100no episode
Coming of Sozin's comet, Fire Lord Sozin launches attack on Air Temples, war of conquest begins.c. -100Avatar Roku (Winter Solstice, Part 2)
Conflict between Zhang and Gan Jin begins.c. -100The Great Divide
Northern Water Tribe city fights Fire Nation soldiers and gets uniforms.c. -85The Siege of the North, Part 1
Kana (Gran-Gran) born.c. -80no episode
Kana leaves North Pole and goes to South Pole.c. -60The Waterbending Master
The Herbalist arrives at the Herbalist Institute in the Earth Kingdom.c. -40The Blue Spirit
Death of Fire Lord Sozin, succession of Fire Lord Azulon.c. -30Zuko Alone
Aunt Wu arrives at her village in the Earth Kingdom.c. -20The Fortuneteller
Prince Zuko born.c. -16Avatar Roku (Winter Solstice, Part 2)
Princess Yue born.c. -16The Siege of the North, Part 2
Mai born.c. -15no episode
Sokka was born.c. -15no episode
Katara born.c. -14no episode
Princess Azula born.c. -14no episode
Toph Beifong born.c. -12The Blind Bandit
Beginning of the 600 day Siege of Ba-Sing-Se.c. -7Zuko Alone
End of 600 day siege of Ba-Sing-Se, death of Iroh's son, Lu Ten.c. -6Zuko Alone
Death of Fire Lord Azulon, succession of Fire Lord Ozai.c. -5Zuko Alone
Haru's village occupied by the Fire Nation.c. -5Imprisoned
Prince Zuko banished after dueling his father.c. -3The Avatar State
Katara and Sokka's father depart from their village to help the Earth Kingdom.c. -2The Boy in the Iceberg
A young Lieutenant Zhao serving under General Shu in the Earth Kingdom discovers the Moon Spirit scroll.c. ?The Siege of the North, Part 2
Aang released by Katara from the iceberg.c. ?The Boy in the Iceberg
Fire Nation first attacks on Southern Water Tribe (resulting in derelict Fire Navy ship near Kana's village).c. ?The Boy in the Iceberg
Founding of the City of Omashu.c. ?The Cave of Two Lovers
Jeong Jeong leaves the Fire Nation military.c. ?The Deserter
Jet's parent killed by Fire Nation when he was 8 years old.c. ?Jet
Katara and Sokka's mother killed in a Fire Nation raid.c. ?The Boy in the Iceberg
Re-occupation of the Northern Air Temple by the Mechanist and his people.c. ?The Northern Air Temple
Song's father taken away in Fire Nation raid when Song was a little girl.c. ?The Cave of Two Lovers

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