Upon death, Avatar Roku was reincarnated and Aang was born, and later raised by Monk Gyatso, a senior monk at the Southern Air Temple and friend of the late Avatar Roku. Even prior to learning he was the Avatar, Aang distinguished himself by becoming one of the youngest Airbending Masters in history by inventing a new technique. As a result of Fire Lord Sozin's increasingly hostile attitude towards the other nations, the senior monks decided to reveal Aang's nature as the Avatar four years before the traditional age (Avatars are usually told of their status once they turn 16) and relocate him to one of the other Air Temples. Learning that he was to be taken from Gyatso caused Aang to flee the monastery on his flying bison, Appa, before being caught by a storm; the life-or-death conditions triggered the Avatar State, encasing the young Avatar and his bison in an air-pocket among icebergs, where he remained suspended for a century. Although Monk Gyatso had snuck into Aang's bedroom late at night to tell Aang that he won’t be relocated to the Eastern Air Temple, it had already been too late.