The son of Rhaegar Targaryen and Elia Martell, Aegon was rumoured to have been killed during the Sack of King's Landing in Robert's Rebellion. In truth, the young prince was spirited away by loyalists, hidden across the Narrow Sea and disguised as another.
Aegon spent his early life as Young Griff, learning the ways of ruling a kingdom he had neither seen nor known. Accompanied by tutors and protectors, the greatest of which being Jon Connington, he learned the ways of peace and war, and of the legacy of House Targaryen.
In 299AC, whilst the Seven Kingdoms burned in the War of the Five Kings, Aegon at last saw his opportunity to reclaim what had been lost. With the Golden Company at his back, once more he crossed the Narrow Sea; this time a man, and not in disguise - he came as a Conqueror, and a King.
The Second War of Conquest
Aegon spent most of the Second War of Conquest fighting in the Stormlands, Crownlands, and Riverlands, working to undo the work of the Lannisters and secure those regions for his house. Following the siege of King's Landing, Aegon united with his aunt Daenerys. They agreed to marry, securing the Targaryen line and uniting their claims as one. Aegon tamed Rhaegal, and with this new found advantage, set to work on driving the Freys from the Riverlands.
After war, came rule. Aegon spent much of the early days of his reign traveling Westeros, alongside his wife. Together they worked to cement their new-forged realm, and restore the relations between crown and bannermen that had so thoroughly broken down.
Seeking to reward his allies, and those who fought alongside him during the War and indeed raised him whilst he was in exile, Aegon commissioned the Golden Company as a standing order for the Iron Throne. He expanded the Small Council, granting the Captain-General a seat, and built for them three castles; one near King's Landing, one in Massey's Hook, and one in Crackclaw Point.
In addition to this, Aegon granted House Connington their ancient lands and the title of lord, as well as passing on the Valyrian steel sword Widow's Wail. These gifts have made the house one of the foremost in the Stormlands, and stalwart supporters of House Targaryen and of Aegon's line.
Indeed, across Westeros, the king and queen worked to restore that which had been lost; first with the return of the dragons, but then with gifts and grants. The Lannisters retained Casterly Rock, as Tyrion Lannister was appointed Lord of Casterly Rock. House Baratheon continued, descended from the joint lines of Stannis and Robert. House Stark retained their Paramouncy of the North, headed off by Jon Snow - made Jon Stark.
In the end, the days that followed the Second Conquest were largely peaceful, save for the Year of False Banners, and Aegon ruled ably for the duration.
Aegon died relatively young, at the age of forty-four. After his death, his wife Daenerys abdicated the throne to allow their son, Rhaegar, to rule. Though largely regarded as a king of no great ability or distinction, Aegon's reconquest of the Seven Kingdoms and decisive ending of the War of the Five Kings earned him a place among the greatest figures in Westerosi history, and saw the return of House Targaryen to the heights of the Iron Throne.