Chapter One - Prologue
Aang accepted his fate as the Avatar and went along with the council's decision to send him to the Eastern Air Temple. He was killed in the massacre along with every other Airbender.
Koah, a Water Tribe Avatar who was born after Aang was killed was killed in the first Fire Nation raid on the Southern Water Tribe, 40 years of age.
Chiyoko was the Earth Kingdom Avatar who lived his Avatar duties in secret until his town was overrun by Fire Nation troops. He was killed at 44 years of age.
The Fire Nation didn't know if the Avatar was alive and didn't know if they were in the Earth Kingdom or the Fire Nation.
AN: If you thought the main character was the Water Tribe Avatar, you were wrong! Tee hee. This was all that was needed in this chapter, really to set things up.