Azulon was the ruler of the Fire Nation from 20 AG to 95 AG. He was the son of Fire Lord Sozin and was Fire Lord before Ozai. He was husband to Ilah, father to Iroh and Ozai, and grandfather to Prince Lu Ten, Prince Zuko, and Princess Azula. Azulon's reign was marked by an increased efficiency in the Fire Nation war machine and massive territorial conquests; his leadership in several Earth Kingdom campaigns won him great fame as a general. He was also responsible for the destruction of the Southern Water Tribe, which was nearly annihilated under his orders.
However, after ordering Ozai to kill Zuko due to the former's attempt to usurp Iroh's birthright, Azulon himself was murdered after his daughter-in-law, Princess Ursa, made a deal with Ozai and provided the latter with a poisonous substance, which was used to end Azulon's life. Although seen as uncaring and cruel, even toward his own people, he is remembered as one of the Fire Nation's strongest and most effective leaders.